Lock command

Lock
Secures a closed door, window, container or other lockable object, sometimes with a matching key.
LOCK <target> WITH <key> You see: You hear a sharp metallic "snap" as you turn the key. LOCK <keyless door> You see: You lock the <door>. Others see: <Name> locks the <door>. LOCK <buttoned container> You see: You securely button your <container>. Others see: <Name> securely buttons <his/her> <container>. LOCK <open target> You see: You might want to close it first. LOCK <already locked target> You see: That's already locked. or: That appears to be locked already. or, for a keyless door: It's already locked. LOCK <target> WITH <wrong key> You see: It doesn't fit. or: The key doesn't seem to fit. LOCK <target> WITH <key not held> You see: But you're not holding the <key>.

Syntax

Locks an object that has keyless or object-specific locking behavior.

Locks a closed object with a matching key held in either hand.

The object must be closed before it can be locked.
When a keyless linked door is locked, its other side is locked as well and a person there hears a soft click.
Some objects use custom behavior and messaging. For example, certain containers lock by being buttoned closed.