You can pick a lock with masterful speed at any door in the game that has three pins. Save the game before interacting with the door. Then, try to pick the lock and remember the correct combination. Before unlocking the third pin, reload your saved game to be back in front of the door. You now just need to enter the same combination as before in under three seconds to get the "Quickly Pick A Lucky Lock" achievement. If you fail, just keep reloading your saved game until you are successful. Note: If you have already opened a door you want to try this at, return to the Clock Tower (your hideout), and it will get locked again.