+1 on turning the wheel. No need to jack the car up, just turn the wheel away from the lock and try. My '95 Spirit has a similar issue-- when the wheel locks, the tires push the wheel back against the lock hard enough that the key won't turn. I can take it out and put it in, but it won't turn to start the car. Very confusing, but it's a neat little (albeit unintentional) antitheft feature.
"Theft-proof" or "security" Torx bits are actually quite easy to come by nowadays at well-stocked hardware stores... not so theft-proof anymore. However, even if you get the lock retainer plate out, you still may not be able to remove the cylinder itself because of the pressure. If you change the cylinder and have to have a new key cut, you may need both original keys to enable the new one to work with Sentry Key. Many lock shops do not (at least they didn't a couple years ago when I was in the field) have the equipment to program the rolling codes used by the transponders.