How about a simple combination lock? I use this lock for a gym locker at a fitness center. I had a previous lock that looked unremarkable and I sometimes left it and had to return it to the lost property office several times. One day it fell on the tile floor and broke, so I was in dire need of a new one. I went to the local hardware store and bought a combination lock, but then realized it was one of those combinations that couldn't be changed. I figured it was only a matter of time before I would forget the combination and be locked in my locker, clothes and cell phone. So I went and bought this one which 1. was red in color, 2. had a combination that was easy to remember, and 3. seemed indestructible. I won't test it by throwing it on the dressing room floor, but I suspect it will hold up well.
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