My gas shut off tool is a simple bracket welded to a rod with a T-handle. It is so simple it probably would not be complex enough for a middle school metal shop project. Of course, there probably is a titanium, diamond studded, folding version that also serves as an ice axe. Mine lives under the bed. I think it came with the house.

If I didn't use it, I could probably handle the task with a pair of vice grips.