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And you should be able to pick your lock with it when you come home from shul on Shabbat so you won't have to carry a key.
http://www.chabad.org/library/article_cdo/aid/935247/jewish/Shabbos-Chapter-Twenty-Five.htmHalacha 7It is permitted to carry a utensil to perform tasks other than those for which it is intended to be used. What is implied? One may take a hammer to crack nuts, a hatchet to cut a dried fig, a saw to cut cheese, a rake to collect dried figs, a winnowing shovel or a pitchfork to feed a child, a spindle or a weaver's shuttle to pierce with, a sack-maker's needle to pick a lock,13 or a mill-stone to sit on.14 The same principle applies in other similar situations.