Carefully drill out the center of the switch housing. I've done this procedure multiple times on salvage steering columns because typically the keys are gone. Start with a small bit and go progressively larger until the pins in the cylinder fall out, or can be picked out. Be careful not to drill beyond the lock cylinder, as you will damage the opening that the switch seats into. I use Vice Grips or similar device to hold the collar while drilling, otherwise the steering column switch housing will get trashed and you'll have to replace the entire column. Once you have the pins out, you will be able to turn the switch, push the release pin and remove the switch. Run down to your local parts store and get a new lock cylinder with keys for $10. Easier than replacing the steering column with a salvage, which would probably require the same treatment anyway.