Locking a door in Minecraft is a simple but important task that can help to keep your belongings safe and prevent unwanted visitors from entering your home. To lock a door, you will need to use a key. Keys can be found in chests, dungeons, or by killing mobs. Once you have a key, simply right-click on the door that you want to lock.
When a door is locked, it will appear with a lock symbol on its front. Locked doors can only be opened by players who have the key. If you lose the key to a locked door, you will need to break the door down with an axe or pickaxe.