I just had a similar experience recently with a Badger disposal. I disconnected the disposal and turned I upside down and shook out the glass I could. Then I took a pry-bar and used it to unblock the small pieces of glass that were responsible for the jam. In hind-sight I could have have used a vacuum without disconnecting the disposal to suck out the loose pieces and then applied the same unjamming method with the pry-bar I believe. Once I did the above and reconnected the disposal it works like new! Good luck!
The first step is to remove all the glass. Remove large pieces using rubber gloves. Next, use a piece of clay or putty, pressing against the inside of the disposer, to remove the small pieces.
When the disposer is free of glass, look under the sink at the bottom of the disposer. If there is a hole, insert a hexagonal wrench and turn back and forth until the wrench rotates freely. Flush with lots of water.
I had the same problem with my InSinkerator disposal! First and foremost, make sure you disconnect power to the disposal so there is absolutely no way that it could be turned on while you are trying to remove the glass (you should be able to do that beneath the sink). Use pliers to remove the big pieces. Try to avoid taking them out by hand but if you must, put on thick gloves to avoid cutting yourself. Then, try using a vacuum hose to suck up the rest of the glass. What you don't remove by then should be small enough to just rinse down. Good luck!
If glass is in it don't try to put your hand down there to fix it. You may have to remove the pipes and the disposal to get it out. If you don't get a good answer here, and you don't know how to do that, I would call a plumber. Stay safe and good luck.
Long nose attachment from your vacuum, just make sure there isn't a lot of water in the sink or else it will ruin a normal vac.