I've done it. Back in elementary school someone told me that there was a secret button in there you can push for emergencies to pop it open without the key. Wasted my snack money on a big pack of paper clips that day and went home hungry.
If a lock is a puzzle, then its key is the complete picture
Rain gets in the lock and if it dosent drain, then when the temp freezes it will make the lock impossible to open with the key, until you put a propane torch on it for a few seconds.