buckle/unbuckle verb/action button.

[BaneOfGiygas]

But then I won't be able to hold people hostage by buckling them into chairs and hooking up a cloaking field generator.

you can always cut their arms off and then buckle them, hard to unbuckle a chair without arms.

Monkeys can unbuckle themselves while straight jacketed

Actually, monkeys can do quite a lot of things they shouldn't be able to do while straight-jacketed. Need to make a thread about it one of these days.