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How to hold a door open with a coin
Grab a coin.
Canadian/us quarter or 20/50 euro cents work well. Avoid using small coins like pennies or dimes as they do not have enough surface area to hold the door open.
Select from:
[a]. Euro coins help with coin lock as well. Fold your hand under and to the right.
[b]. Pull up and shove the coin in. Your hand should go so that its ring with the shape of a dollar on it faces front.
[c]. Open the door just wide enough to access the coin you are holding. This way the coin will be able to hang on to the door by itself.
[d]. You may need more than one coin if you're unable to jam the door open with a single coin. If you're in another country like australia or south korea, use the largest and thickest coin possible.
[d].