Another option is to drill some 3/8 holes in the backing plate right behind the brake shoe surfaces. Slip in a small screwdriver and pry the shoes away from the brake drum surface. You may be surprised at how little effort is required to unstick the shoes away from the drum, as opposed to trying to turn the drum.
Of course, that is after checking the park brake cables as Lynn suggests.
You can cover the holes with inspection plugs or weld and grind the holes shut afterwards.
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