If the nut doesn't have a spinning collar you can get a gatorgrip universal socket.
Like above. Or if it has a spinning collar, the socket won't fit, you'll have to get somone to weld a spare bolt to the centre of the locking bolt and remove as normal.
I always advise people to not use locking bolts. firstly they're a pain in the ass to get off just because they're such poorly made bolts, the thread will fuse to the hub and the key pattern will lose its shape under pressure of a breaker bar (which you will need eventually). Secondly your wheels probably aren't that desirable to warrant stealing. No offence, but I'd only use the most well made locking bolts on £1000+ alloys