Please tell me you're not using the 1382 or 7500 locks?
Get cylinder locks. You don't need to use the locking bar just get better locks.

Yup, looks like them. They used to sell the 1382s then sold out. Now they are 7500. Most my games are 1382 but had to pick up some 7500s.
If they are 1382s I still need 10 of them so would buy some if changing locks.

I haven’t operated games in two decades. But always bought mine from a locksmith company. They would key the locks alike. And when I needed more they would just key more. I wouldn’t recommend any of the popular pinball suppliers that sell large quantities of the same key #. You could check around to see who’s selling individual key #s and can key future locks to the same key.

I’m pretty sure it’s more of one of those “I know what you did and you need to stop” things. Also pretty sure if the person that did do this reads this they won’t do it again.

I do and I’m not an op. I use the 1382 locks on all my pins. So have one on my key chain. I also host a monthly get together and at least a dozen of my friends carry the same key because most their games run off the same key.