Does anybody have or use one? How well does it work?

With schools partially closed we will have grandkids running around the house. Their Dad (our son) is a former Jeffco reserve Deputy so I'm sure he's impressed on them the "don't touch" rule, but kids can be kids.

I have one of those finger safes but hate the fact that it requires batteries and every couple of months will fail to open when one of the batteries goes dead (then I need the key to get it open.)

Any recommendations? I'm really looking for something that locks, I don't want to just hide the gun, I want to secure it.

Thanks in advance!