Bests & Worsts Reviews from Amazon

This is one of my few negative reviews on amazon. I bought this same model one month ago to use at the neighborhood 24hrs gym. It seemed like a good idea as my eyes aren't so great anymore and not having to look at the numbers seemed cool. I figured the negative reviews were just user error. After all its a master lock. I still have one I have used since college 30 years ago... numbers are now worn off but it works. I set it this new slider up and have used it successfully like 20 times. Tonight at 2am with no one around and it being 20 degrees out it failed, with car keys in locker and I'm in shorts. Something broke inside and it would not open. I bought this new one to use at work..I don't trust it now. I had to call the police to cut it off... they were nice. No more sliders .