Don't handle him until he eats. I know its hard but you must resist!
How old or how big is he? You might be able to feed him larger prey items, or move him to a smaller enclosure. 20g is pretty big for a hatchling.
Leave him alone completely. check temps without disturbing him. You can pick him up and move him to clean, but that is it.
I would try leaving the prey item in the cage with him overnight. He may or may not eat it with some privacy.
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