Before you worry about getting it out, I would look everything over real well and figure out why it is stuck. Start by looking on the inside and make sure nothing fell in the way of it moving, then go outside and underneath and check for things like bent rods or slider bushing out of the track. If all looks ok, have someone hit the switch in and out while you are looking underneath, see if you can find the reason it is binding. If it is not binding on anything check the fluid level.
If the motor is still running there is gonna be another issue.
If the motor does not run, check the fuses.