buckle/unbuckle verb/action button.

[Frank_Stein]

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

Well, that's a human sized jacket, so of course it's a little loose fitting on a chimp