Slide hammer/steering wheel puller/pully puller...... all can be rigged to pull the brake hub off. Question is, is it really stuck, or just hung up on the brake shoes by the wear ridge? A couple of good slams by a sledge might break it free... or if it happens to break the hub, chances are it was worn enough it needed replaced anyhow. If that dont work....try a bigger hammer.

The only problem Ive ever had with brakes locking up was a master cylinder problem.... it would build pressure on a peddle press, but would not release it when taking my foot off the brake peddle. This problem occured on the trail and was a real bear to diagnose and deal with. Ive since added a master cylinder to my spare parts bin.