joules posted:I would remove the lock and take it to a locksmith who can extract the broken key and cut you a new one.
When I was in college I bought a 61 VW Bug with the key broken off in the ignition switch. I'd grab the screwdriver from under the driver's seat and use it to turn the ignition switch. Drove it to a locksmith who charged me $10 to extract the broken key and cut me a new set of keys.