Squirt it in the cylinder with the little red tube.
To change the lock cylinder, you have to dig into the steering column until you have the turn signal mechanism out. Depending on the year, you may have to get a key that works with your alarm system.
The wire on the top of he column may be sticking at the electricial part of the switch further down the column. To check, you have to drop the column. The electrical part of the switch may be broken as well, you would also have to drop the column to get to it.
It could be the brake lockout switch either mallfunctioning, or out of adjustment/loose.