20p shopping Trolley trick hack

How to unlock a shopping trolley with just two 20p's. I have been doing this for years on all shopping trolleys I come across and told everyone I've known. I thought this was common knowledge. Just line them up properly and it works. After a bit of practice they will unlock first time every time.

[@techtinkerin]

You don't need any coins at all! 😄

[@_wormlet]

How do you do it?