We don't use child locks in general. Both my boys were very verbal early on, so we started with "danger" for plugs, the gas stove, and places where little children shouldn't be. We do have some plug covers in the bedrooms, but not all over the house.

Generally, I've found that rules, even for one-year-olds, work better than locks. Ours have never been allowed to rummage through cabinets in the kitchen, so the under-the-sink stash is a non-issue.