Accidentally left freezer open, now it is running super loud

Hello, I accidentally left my freezer open a crack. I came home and there was a loud buzzing sound. I closed the freezer door, and it is still buzzing super loudly and has been for about 20 minutes.

Is it just trying to cool back down, or do I need to defrost it?

Thanks.

submitted by /u/handsomesharkman
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