> When I was that age I routinely broke into my dad's workshop that he had locked up to keep me away from his power tools. I had enough time that I would try every combination over a few weeks until I got the code to work.

Which is one reason why a combination lock (especially the three-number ones that are common on gun safes) are woefully inadequate for gun safety. Part of the responsibility is on marketing and inadequate regulation around gun locks, but most of the blame is on the consumers of said locks (the parents), who should either a) know better or b) not own a gun.