I once saw a PC security case where instead of the lock cylinder retracting a bolt, it turned a screw thread and opened the case by about half a millimeter. It took the guy unlocking it a good fifty turns to get the PC out of it.
And there were two - one on each side. What's more, it was a tubular lock, so if you were single-pin picking you'd have to pick it 5 times per rotation.
Nothing that would stand up to a battery powered angle grinder, of course.
Tubular locks are trivial to pick and the lock turning the screw mentioned above would be just as simple with a tubular pick than with the original key.
And there were two - one on each side. What's more, it was a tubular lock, so if you were single-pin picking you'd have to pick it 5 times per rotation.
Nothing that would stand up to a battery powered angle grinder, of course.