A set of Fingercuffs

What we have here is a cheap wicker tube. The idea is, you get someone to stick their fingers in it, and then they're trapped! Ha ha ha!

Assuming they're unwilling to just tear your stupid wicker fingertrap into bits, of course, which most people won't be.

When placed on a willing target (or forced on an unwilling target), restrains their hands until they are shown the secret technique to escape. Once the target has been shown the secret technique, they can no longer be restrained by the Fingercuffs