I purchased a 1-1/8" Utility Cam lock from Lowes, good for up to 3/4" wood. I determined the where on the door I needed the lock, then drilled a 3/4" hole with a spade bit. It made a beautiful hole. I then followed the instructions and installed the lock, using the 90 degree piece.
For the lock to catch on something and stay, I installed an L bracket just inside the door, on the cabinet wall.