The key fits inside the lug, Or around the outside?

If the key goes over the lug,........wrap some aluminum foil around the lug and try to loosen all the locks with the key and a 4-way...Not an air gun!!! and that should do it.

If the key fits inside the lugs.......Well, Your pretty much outta luck and need to order one or more of the identical lock key.

Good Luck Homie