Take a look at the various handgun safes with a mechanical pushbutton lock. There are several you might consider. Most are made from thicker steel than the electronic ones, ranging from 16ga to the heaviest on the market which is 7ga. No batteries to change and no electronics to fail just when you need it. They are relatively simple, proven reliable and durable over many years of use. If you ever do wear out a lock, just replace the lock. Unlike all the electronic ones that are throw-aways.