[XorNot]

If you think a safe can't be opened by...practically any law enforcement agency quickly, then I don't know what to tell you.

I could talk about safe-cracking as an art, but I'd direct you to go look up a YouTube video a plasma cutter going through steel. The reality is most safes you buy commercially can be broken in under 30 minutes by an experience locksmith without such tools.

[dTal]

Safecracking aside, I imagine trying to forcibly compromise a decent safe stands a decent chance of killing a child locked inside, particularly if you reach straight for your plasma cutter.