Locks is a lightweight mod that introduces universal locks that you can attach to blocks of any kind. You can use this mod to lock chests, barrels, or any other container block of that sort. You can also lock doors, trapdoors, etc. You can lock literally any block in the game to make them non-usable for other players. Locked blocks cannot be used or destroyed by players in their locked state. You need a key with a matching ID to open a lock. The master key is a key that can open or close any lock in the game regardless of their ID. This key can only be obtained in creative mode or using the /give command. The key ring is a useful tool that can store up to 9 keys and toggle any lock with an ID matching any of the keys stored in it making key management easier. This will be helpful when you have multiple locks to maintain.

Take a look at the screenshots to see what you can expect from this pack. This is a Forge mod and download links are given below.

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Locks Mod