You could always ditch the keyed lug nut altogether. Pound a socket onto it or even tack a nut to the end of it...then just replace it with a normal lug.
You may also find a shop to take them off for you. I dont know if theyd give/sell keys though...u would just have to ask. If you get it off and want to keep locks, but dont have/or get to buy a key, you can buy new locks from somewhere (autozone, etc), that usually come with a key.