Issue - Stuck Garbage Disposal
Unplug the unit from the outlet.
Find the large hex wrench that should have come with the garbage disposal and use it on the hole in the bottom center of the unit, turning it back and forth in both directions (it’s okay to use force)(If you don't have it, check your model and go to the ACE across the street to see if you can buy it.)
Then plug it back in, and try it again. They have also in the past thrown a ice cubes down the sink to clear any physical obstructions.
Never stick your hand down the disposal, unplugged or not, in case there are sharp objects you weren’t aware of that fell down and got stuck inside.