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.