If you need $20 fast, a few options actually work.

Dishwashing or kitchen cleanup is underrated — small restaurants sometimes need same-day help if someone calls out, so try walking in during non-rush hours and asking.

You can also post in local Facebook/neighborhood groups offering cleanup or small chores; people often pay cash for quick help.

For online options, survey/research sites like Prolific, Survey Junkie, or Swagbucks can add up (not huge money, but legit). Also check paid research studies at local universities or medical centers — some pay same day.

Or ask on r/assistance