You may need more than one coin if you're unable to jam the door open with a single coin. [substeps] If you're in another country like australia or south korea, use the largest and thickest coin possible.
[header] How to hold a door open with a coin [title] Grab a coin. [step] 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.