hi. i need advice on how to get locking wheel nuts off without a key. there ford locking nuts & the key has broken. tried going to ford for a new key (have the code number for the key) but they can't get me one. tried hammering a socket on, tried useing a hammer & chisel even tried useing one of them locking wheel nut remover things (reverse thread that tightens up on the nut as you try to undo it with & impact gun) even this didn't work. im starting to run out of idears

help please!!!!!