How to Fix a Seized Lock
Stop at the local hardware store before you make a call that $100-a-visit locksmith (sometimes even more! Yikes!). Some WD-40 sprayed into the keyhole will lube the mechanism quickly. If that doesn't do it, you may have a broken spring or tumbler—and need that pro after all. If so, keep the new lock from locking up by giving it a yearly spritz of long-lasting Teflon spray.