I bought a plastic storage box at Joann's that has little sliding latches on it. I keep all my rotary cutters in it, then padlocked. I even do this at home. I have small grandchildren and little ones can get very curious. (even though they are not supposed to be in MiMi's sewing room). I would feel TERRIBLE if one of them got a rotary cutter and hurt themselves. The key to the padlock is kept up & out of site. As with guns, knives, etc. we are educating them as we go. But, until they are all old enough to understand the consequences, they will be kept under lock & key.
This is just my idea and the way I do it.