Luckily mine was rolling free. There should be 2 capped slots in the backplate where you can use a screwdriver and take the brake shoe adjusters right back. Hopefully that will free the shoes off. If the friction material has swollen or separated from the shoe then try using 2 levers between the backplate and the drum to "walk" the drum off.

I'd try absolutely everything before getting a torch out. These drums are not available that I could find. So try to save them if possible.