Lock locked

The Lock locked trigger helps you react when a lock reaches the locked state. Use it when you want Home Assistant to confirm that a door is secured before turning off lights, arming an alarm, or sending a status update.

Using this trigger from the user interface

If you prefer building automations visually, Home Assistant walks you through this trigger step by step. You pick what to watch, tweak a few options, and save. No YAML knowledge required.

To use this trigger in an automation:

1. Go to Settings > Automations & scenes.
2. Open an existing automation, or select Create automation > Create new automation.
3. In the When section, select Add trigger.
4. Select what you want to monitor. Under By target (see Targets), pick the area your lock is in, like your front door or garage entry. You can also select a floor, a device, a specific entity, or a label.
5. From the triggers shown for that target, select Lock locked.
6. Under Trigger when (see Behavior), pick Each, First, or All to control how the trigger behaves when multiple locks are targeted.
7. Under For at least, set how long the lock must stay locked before the trigger fires. Leave it at zero to fire immediately.
8. Select Save.

Options in the UI

Using this trigger in YAML

If you work directly in YAML, or you want to know exactly what Home Assistant does under the hood, this section has the technical reference. It lists the field names you use in YAML, their types, and which ones are required.

In YAML, refer to this trigger as lock.locked. A basic example looks like this:

trigger: lock.locked
target:
  entity_id: lock.front_door

This fires when lock.front_door changes to the locked state.

Options in YAML

YAML sometimes provides additional options for more complex use cases that are not available through the UI.

Targets of the trigger

This trigger requires a target. The target is the object that Home Assistant will watch. You can select a single entityAn entity represents a sensor, actor, or function in Home Assistant. Entities are used to monitor physical properties or to control other entities. An entity is usually part of a device or a service. [Learn more], a device, an area, a floor, or a label as a target, and Home Assistant will watch every matching lock entity behind that target.

• Entity: one specific lock entity, such as lock.living_room.
• Device: every lock entity that belongs to a device.
• Area: every lock entity in a room or area.
• Floor: every lock entity on a floor.
• Label: every lock entity that shares a label.

You can also select different target types in one trigger. For example, you can add a specific entity and an area as targets in the same trigger to monitor both of them at once.

Behavior with multiple targets

When you target more than one entity (or select an area, floor, or label that contains several), the Trigger when option controls how the trigger responds:

• Each (any in YAML, default): the trigger fires every time any one of the targeted entities transitions. For example, if you monitor three motion sensors in the living room and someone walks past sensor 1, the automation fires. When they walk past sensor 2 a moment later, it fires again. Every individual event counts.
• First (first in YAML): the trigger fires only on the first transition in the targeted group, then waits until all targeted entities have reset before it fires again. For example, if you monitor the same three motion sensors, the automation fires when the first one picks up movement (someone entered the room). The other two firing afterward are ignored, so you get one notification per “someone walked in” event instead of three.
• All (last in YAML): the trigger fires only after the last targeted entity in the group has fired, meaning all of them are now in the expected state. For example, if you monitor the lights in the living room, bedroom, and hallway, the automation fires only once all three have turned off. This is useful for scenarios like “start the robot vacuum only after every light on the floor is off,” so you know the room is truly empty.

Good to know

• The trigger fires only when a lock changes into the locked state from a known state. If a lock comes back from unavailable or unknown, that recovery does not fire this trigger.
• Use For at least if you want to wait until the lock has stayed secure for a while before acting.
• To react when a door is no longer secured, use Lock unlocked.

Try it yourself

Ready to test this? Go to Settings > Automations & scenes, create a new automation, and add this trigger. Save the automation, then change the state of the targeted entity to watch the trigger fire on your actual entitiesAn entity represents a sensor, actor, or function in Home Assistant. Entities are used to monitor physical properties or to control other entities. An entity is usually part of a device or a service. [Learn more].

More examples

Real scenarios where this trigger fires in automations and scripts. Copy any example and adapt it to your setup.

Automation: turn off the entry light after the front door locks

When you lock the front door after coming in, you may not need the bright entry light anymore. This automation waits 30 seconds after the door locks, then turns the light off.

• Trigger: Lock locked
• Target: Front door lock
• Trigger when: Each
• For at least: 00:00:30
• Action: Turn off

alias: "Turn off the entry light after locking"
triggers:
  - trigger: lock.locked
    target:
      entity_id: lock.front_door
    options:
      behavior: any
      for: "00:00:30"
actions:
  - action: light.turn_off
    target:
      entity_id: light.entry

Automation: arm the alarm when all the outside doors are locked

If you want one final check before arming the house, wait until every outside door lock reports locked. This automation arms the alarm only after all targeted locks are secure.

• Trigger: Lock locked
• Target: Outside door locks (by label)
• Trigger when: All
• For at least: 00:00:00
• Action: Arm alarm away

alias: "Arm the alarm after all locks are locked"
triggers:
  - trigger: lock.locked
    target:
      label_id: outside_locks
    options:
      behavior: last
      for: "00:00:00"
actions:
  - action: alarm_control_panel.alarm_arm_away
    target:
      entity_id: alarm_control_panel.home_alarm

Still stuck?

The Home Assistant community is quick to help: join Discord for real-time chat, post on the community forum with the trigger you’re using and what you expected to happen, or share on our subreddit /r/homeassistant.

Related triggers

These triggers work well alongside this one:

• Lock unlocked: Triggers after one or more locks unlock.