SRD:Open Lock Skill

Open Lock (Dex; Trained Only)
Attempting an Open Lock check without a set of thieves’ tools imposes a –2 circumstance penalty on the check, even if a simple tool is employed. If you use masterwork thieves’ tools, you gain a +2 circumstance bonus on the check.

Check
The DC for opening a lock varies from 20 to 40, depending on the quality of the lock, as given on the table below.

Epic Check
You can open locks more quickly than normal.

Action
Opening a lock is a full-round action.

Special
If you have the Nimble Fingers feat, you get a +2 bonus on Open Lock checks.

Untrained
You cannot pick locks untrained, but you might successfully force them open.