Never seen a locking pocket door, but I'm sure there out there. We're all guessing with the lack of percise details you provide. Exactly where is the hole? How big? How close to the edge? How close to the lock? What is the visibility of the door location? How nice would you like it to look when you are finished? Ya know, you could put some matching color or woodgrain contact paper over the hole & you're done. You could even s___ sorry i better stop.