How to screw into "used" holes in wood?
I would use wood glue versus hot glue. If the existing hole isn't too big, just find a screw that fits the hole, put glue in the hole and run the screw in to the hole/glue. If the hole is too big for the screw, add a toothpick (as d. george suggested) to tighten it up and add glue and screw. If the hole is REALLY too big, drill it out to match the size of a wood dowel, glue the wood dowel into the hole with wood glue, let it dry, cut it flush, then screw in the latch.