Sorry about jumping to conclusions... try taking her/them out shooting more often, if they/she can show proficiency with a given firearm, have an extra key made, if not, don't. I'm sure you'll find that it'll become a full win or full loss situation. If they pick up on the shooting sport, it won't be long and you'll have extras for every lock you own, and if they don't, the locksmith won't be making any money off you. I've had some folks who I thought were pretty puny surprise me with how well they took to an 870 or a 1911 Colt, with a little coaching.

Troy