Something like this happened in my Dodge Dakota. One of the springs fell off for the star adjuster so it was adjusting outwards, thus locking that brake. I wore a set of brand new shoes in under a week
. Needless to say, if any brakes were applied it locked up and I slid sideways. Drove it like that for a week until I fixed it and then drove for months after I fixed the problem with completely worn shoes on the right side. Pop off the drum and look at the star adjuster, that is if you an get the drum off. Mine was locked on there and was HOT because of the locked brakes, be careful. My buddy blistered both his hands when he grabbed mine. It was quite funny to watch.