[vectorit]

Sounds to me they adjusted the shoes to tight, and as you drove home they heated up and glazed.

I'd take the wheel off while you have it on a jack stand, and spin the drum to see how free it spins.

If it can't spin on it's own, then the shoes are to tight.

You can adjust them down a smidge, but then the damage is already done. Though the squeal should fade away over time, but if it's really bad then I do the following.
Take the drums off and scuff the drum/shoe contact surfaces, then reassemble with a good adjustment to let the drums turn without binding on the shoes. (this all walking the fine line of - you go that far you might as well do it all with new parts, but if you are tight on cash like most of us out there then...)