oh yeah. heck, van door motors are backdriveable by design. How else do you open a van door if the switch breaks or something?
Just because it's a worm drive doesn't mean it's not backdriveable by default. Take a look at what Martin Sprockets has to say:
Martin Sprockets
That being said, I only know that previous year's van door motors were backdriveable. That might not be true this year. I'll clamp one down tomorrow and go at it with a cresent wrench.