Redneck cabinet locks

William is into everything, including our kitchen cabinets. While I don't really care when he pulls stuff out of the cabinets, I don't want him getting into the cleaning supplies under the sink.
Naturally, that's his favorite cabinet. We haven't put the locks on because we are about to get new cabinets. One day Caroline tapes the cabinet doors shut and we thought it was funny. But it worked and he can't figure out how to get in...at least for now. So here are our new cabinet locks...