UPDATE: 26/2/2020
Added a demo video that explains in detail how these are meant to work:
https://youtu.be/bQ6pvrzdD4U

UPDATE:
Printed coin pick and tested today - works like a charm and somewhat better that coat hangar version - printed in PLA.
Not tested yet - tab pick (the one to eject the coin)
*Dummy coins printed a touch under spec on my i2, my i3 is better calibrated but is waiting on new step sticks, and my self-designed machine is still in progress.

I originally designed this tool from 2.5mm diameter coat hangar wire, when I was working as a trolley collector.

The token system issued by the designers:
http://mrvsolutions.com/En/index.html
Just was too much of a pain to use when one has to collect over 1000 trolleys a day.

If you understand the internal mechanism of the lock, you can use the second tool to eject a coin if it's still present in the trolley.
I'll get round to making a tutorial video on this at some stage.

I have yet to print and test this design, but have included an image of an original prototype. Will post an update when I have - It's on the bed as we speak.

I have also included coin dummies for Australian $1 and $2 coins.
Everything you need to get practiced with these tools on a budget.

If you want to remix it - I'll gladly post the cad files.

------------------------------CAUTIONS!----------------------------------------
I don't want to hear what illegal things you get up to with these as I DO NOT condone breaking of the law.
Better yet - just don't do anything illegal with them.
FYI modern coin acceptors on nearly all vending machines know plastic from metal. Some even have cameras and GSM modems - you have been warned!