How do you fix the sunroof on a 2003 Sunfire if it opened and now the switch doesn't work and the sunroof will not close?

Most sunroofs will move manually.

you need to remove a cover to get to where the motor is and usually there is a hole to put a screwdriver or Allen key into to turn the motor manually.

If not just remove the motor and push the glass shut but doing this will mean you need to reset the motor before refitting it.

I worked in a sunroof factory for 10 years !!