I do home childcare and where I live, there are few acceptable cabinet locks if you want to have things like platic wrap, baggies and foil...or drawers with pizza cutters and potato peelers in them. You run out of upper cabinet spaces (with bins for the utensils, etc) realy quick. I even ahve a garage cabinet for the bulk of my baggies and such.
But one acceptable safety lock is the Tot Loc magnetic locks. They are a PITA to install (my hubby can attest to this)..but you can flip the little red thing on them so they are "open" when you need them to be for ease..and flip it the other way for them to be locked when it is an issue.
I love them and have them all over my house...all bathroom cabinets and several of my kitchen ones and my craft cabinet for daycare kids.
They can be purchased at Babies R us and other places like Walmart I think.