If you make the lock too strong, the thief just cuts the hinges of the locker. It doesn't take much for your lock to not be the weak link in the security chain

If you make the lock too strong, the thief just cuts the hinges of the locker. It doesn't take much for your lock to not be the weak link in the security chain. The unattended security measures are only there to delay a criminal long enough for a human to take action. Are you smarter than a dumb hunk of metal? Yes, you are. So is a thief that is stupid by human standards. The only reasonable counter to a human criminal is another human. The lock is productivity multiplier capital for that human. If there is no security guard, there is nothing there to multiply, and the lock and locker are only increasing the security you provide for your own stuff. Do you really want to check up on your locker between every set? It would be annoying, but you could do it. You wouldn't be able to do a long cardio workout, though. As such, time spent shopping for a stronger lock is probably not as useful as time spent yelling at the gym management to stop the locker room thefts. They need a guard to make sure no one is popping locks in the locker rooms. Until they have one, what's going to stop someone from going in with a rotary tool and a stolen staff shirt or handyman outfit, telling the customers that they have to occasionally cut locks off when people abandon their lockers? A customer would only have reason to challenge that ruse if the thief were cutting off their own lock, but a real employee would know that the thief was not a genuine employee or contractor authorized to do that to anybody's lock. If locker room thefts are a general problem, you have to hire a person. If the gym won't do it, individual customers could, at greater overall cost. But really, that's not necessary. Just don't keep valuable items in a gym locker. Leave them at home, put them in the trunk of your car, or have a trusted human hold them. Keeping your valuables in a gym locker is like parking your car on the street in Detroit. Sure, it is theoretically possible that your security measures are sufficient, but you are placing your property at much higher risk to begin with.