HACKSAW! The blade is thin and might get in where thicker tools couldn't.

Scissors! Even a small pair in a bug-out kit is something a child knows how to use.

Vice Grips!

If you're storing food and stuff in 5-gallon plastic buckets, do yourself a favor and invest $3 or so in an bucket opener. They're too simple and too cheap to risk ripping a fingernail into the nailbed, destroying a useful bucket, or contaminating the contents.

Don't bother with lockpicking, it takes a lot longer than they show on TV. Have spare keys to everything. If you're evacuating, all adults should have spare car keys on sturdy cords around their necks. If you have to get past someone else's padlock, that's what hacksaws are for.

If you haven't already, start a Key Container. Drop any found or discarded or currently useless key into it. There are limits to the number of combinations to key locks, one might fit something else. Just because your new Ford has electronic locks doesn't mean your old Ford key won't open your neighbor's older model.

Sue