Open / Close / Lock / Unlock / Pick

OPEN and CLOSE open and close an object or a door.
LOCK and UNLOCK lock and unlock a closed object or door.  You must have the requisite key to LOCK or UNLOCK.
PICK can open a lock without having the key.  In order to PICK successfully, you must practice the appropriate skill.

Syntax: open   <object|direction>
Syntax: close  <object|direction>
Syntax: lock   <object|direction>
Syntax: unlock <object|direction>
Syntax: pick   <object|direction>