Ak neviete čo s mincami, použite ich na podržanie dverí

Sometimes you need to hold the door open temporarily, though, such as if you’re moving furniture through the doorway. If you’re in a pinch and you don’t have a wedge on hand (the preferred method, see Warnings below) you can hold the door open with a coin.

How to Hold a Door Open with a Coin – wikiHow