Comes with 2 keys.  To be sure this is the lock needed, measure from the center of the lock bar to the center of where the lock goes.  This should be 5/8".

If you need to remove a lock like this by drilling it out - here are the instructions.  Start with a 1/8" drill bit.  Drill into the very center of the lock about 1/2".  Go up one size in drill bit and drill in again 3/8".  Continue going up gradually in size until the pins fall out or you can pull the pins out of the lock.  Stick a wood or sheet metal screw into the first hole you drilled and twist.  It should unlock the door.  Once the lock is opened, take the lock off the door.  The reason we gradually go up in size in drill bits is there are case hardened brass pins and if you try to start with a larger size you will grab the bit and break it.  If that happens you are in a real mess!