Worst place - When the keypad batties die you will have no way of opening the safe as the keys are inside.
Safest place to keep the key is in the safe itself?
I am disappointed that no one suggested hitting it with a potato, certainly cheaper than an actual replacement key. :(
I think you mean a tubular lock,7 ,9 , or 10 pin. Lockpicking lawyer on youtube recommends some picking tools, I found them on ebay for £12.