I have a shop in my basement with all the electrical outlets on a single circuit. I would like to install a key switch that will turn off and lock that circuit for safety reasons as I do have very young exploring children and there a a number of power tools in there.
I have done numerous Google searches for "circuit key switch" and various patterns but I am not getting any real hits. I have also searched the major home stores for this sort of thing and it seems to be beyond them as well.
I realize I could simply turn off the breaker but I would like it so that the children cannot just turn it back on. This is also something I was to install near the light switch so that when I leave, I will remember to lock/turn off that power circuit.

Can anyone tell me where I can find such a thing or a better keyword that I can search on?