illni07,
You would also have to NEVER leave the key anywere your kid could get to it (even for a few minutes and even when you are sleeping or out of the house) if you keep it locked up at all times, & if you take it somwere for whatever reason you can never leave your pocketbook out of your sight for even a moment… and these are not even creative ways of getting hold of it!!
bkitzur its nearly impossable to make sure your kids will never get access to it