Yep, Daves right. I got my Commodore key cut for $26 at Mister Minit.
All it does is lock and unlock your car, wont start it. I put the copy in drivers side door lock. Last thing I do is turn it to the left twice, second time stops anyone from popping up buttons by hand or other means, put it in my boardies pocket and zip it up. If in wettie, just put it around your neck under suit.
Just dont leave it in door for whole session like some peanuts do, me