---
title: Lock Entity
sidebar_label: Lock
---

A lock entity is able to be locked and unlocked. Locking and unlocking can optionally be secured with a user code. Some locks also allow for opening of latches, this may also be secured with a user code. Derive a platform entity from [`homeassistant.components.lock.LockEntity`](https://github.com/home-assistant/home-assistant/blob/master/homeassistant/components/lock/__init__.py).

## Properties

:::tip
Properties should always only return information from memory and not do I/O (like network requests). Implement `update()` or `async_update()` to fetch data.
:::

| Name | Type | Default | Description
| ---- | ---- | ------- | -----------
| changed_by | string | None | Describes what the last change was triggered by.
| code_format | string | None | Regex for code format or None if no code is required.
| is_locked | bool | None | Indication of whether the lock is currently locked. Used to determine `state`.

### Supported Features

Supported features constants are combined using the bitwise or (`|`) operator.

| Constant | Description |
|----------|--------------------------------------|
| `SUPPORT_OPEN` | This lock supports opening the door latch.

## Methods

### Lock

```python
class MyLock(LockEntity):

    def lock(self, **kwargs):
        """Lock all or specified locks. A code to lock the lock with may optionally be specified."""

    async def async_lock(self, **kwargs):
        """Lock all or specified locks. A code to lock the lock with may optionally be specified."""
```

### Unlock

```python
class MyLock(LockEntity):

    def unlock(self, **kwargs):
        """Unlock all or specified locks. A code to unlock the lock with may optionally be specified."""

    async def async_unlock(self, **kwargs):
        """Unlock all or specified locks. A code to unlock the lock with may optionally be specified."""
```

### Open

Only implement this method if the flag `SUPPORT_OPEN` is set.

```python
class MyLock(LockEntity):

    def open(self, **kwargs):
        """Open (unlatch) all or specified locks. A code to open the lock with may optionally be specified."""

    async def async_open(self, **kwargs):
        """Open (unlatch) all or specified locks. A code to open the lock with may optionally be specified."""
```