system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it hard to open a refrigerator door right after you close it?
gpt
You just closed a bunch of warm air in a box of cold things.  The air cools really fast and the pressure drops forming a vacuum.  It takes a few seconds/minutes for the few gaps in the door seal to allow enough air in to equalize the pressure.