Can you adjust your parking brake from the handle? What year? Try to adjust the brake loose so the shoes inside the drum will relax & it will fall off with ease.

 

Dont know your vehicle, but...
If there are threaded holes on the drum, find some metric bolts that fit and push the drum off.
Many cars also have a rubber grommet on the back over a window that gives access to an advancing mechanism. With some knowlege and luck you can loosen the brake shoes.