Coin Lock Release Tool
Honeslty, what’s more inconvenient than needing a shopping trolley but not having any change handy to unlock one? This tool lets you unlock a shopping trolley without needing to leave anything behind.
So there are already a bunch of these available to download, but I made mine before checking. This design has a handy ring to attached to your keys, and comes in a standard a phallic version (for when you really want to fuck the system).