I live in a town where no one locks anything and I know how to lock pick and have lockpicks because I keep losing keys... That would be useless to me... I'd sell it on Ebay and get myself a GOOD super power!
it really depends on the scope of its power, like if it could somehow allow me to get past security guards, cameras, dogs, lasers, electronic locking system, the whole shizzam then it would be pretty snazzy, otherwise its just a magical set of lock picks. if it could do all of the above I would break into the local store on a daily basis and steal a red bull every day.