I don't know who needs to hear this, but if a former boss tries to scare you into signing something after you've already stopped working for them, DO. NOT. SIGN. ANYTHING. Don't even sign a damn birthday card. You owe them nothing, and they probably don't even have any leverage against you.
u/WhitePinoy recently posted to r/antiwork seeking advice after their former employer demanded that they sign a non-compete agreement a month after firing them. OP's reason for getting sacked in the first place is pretty shady in itself. Now their ex-employer is basically trying to put them out of work. Keep scrolling for the whole story.
"Screenshot the email and anything you get from the old company. You really should see a labor lawyer. That form is laughable. They fired you .. YOU have NO reason to sign Anything for them. That BS about litigious consequences is there to scare you. They have NO leverage. But YOU DO. Firing someone after a medical leave is not legal. DisposableMiner is right. But you might well have a lawsuit for the firing, as well as harassment." —u/NefariousnessSweet70