Locks are to slow an attacker. A determined attacker can bypass almost any lock, but not stealthy enough. If you drill the lock in my front door, you wake up the entire street. If you can pick it in 30 sec in the middle of the night, you wouldn't wake up anyone, but some kind of camera probably picked you up.

I used to pass this bicycle parking at a train station twice a day. I'd always look at the locks (or lack thereof) while walking, quickly thinking which ones I could certainly open (and the question is always: how quick). But I never gave in to the desire, despite a lack of locks and peers (for practice/fun).