A few suggestions since we now have a lock-door system.
1) Lockpicks [graphics use the sickle handle

] in order to open doors, and a skill 'lockpicking' for opening doors which are locked. The lockpick should be quite hard to make, and it will look suspicious when you ask for one... The skill should allow the user to try once every Real Hour on a door, [to prevent powergaming and entering by trying 999 times] (It will be too suspicous to try again, you should wait a while before trying again); also I would make anyone picking get a forced #me "is picking the lock", so you'll get caught

Skill should also be dependant on Dex, Perception and Intellegence
2) Ability to copy keys...or at least an NPC, you USE the key with him, and he'll give you 2...
3) Ability to make keys never decompose
4) Ability to make a room where the things never decompose, so you can lock the room and make a storage room for guilds.
Thank you