Lost key

Have a locksmith make a key, or drilling it out is about the only ways possible. You could do a car theft method with a slide hammer but there is risk involved in damaging stuff. Another way is to force the pin into the lock but damage to the column is possible also but both are easier than the original two methods

The tumbler can be replaced by removing the steering wheel and part of the column. NOTE: If you have a factory security system, the system will need reprogramed. If it has an airbag, disconnect the battery for at least 30 minutes prior to working on the vehicle.