Pfft. I had a medium-grade bike lock in college, and I once accidentally stole a bike because somebody with the same color/model/lock parked in front of the same building as me. My key was a bit stiff and I kind of had to force it, but it worked fine. I just remember thinking "why does this seat feel different?" Took me a couple of days to figure it out. I put it back- sure hope the original owner came and looked again after his initial disappointment that day.