S10 Blazer park brake is stuck down

Either the front cable or the two rears (or all three) are likely seized up. Hold the release and pull the pedal up, then climb under the truck (Assuming it's properly chocked of course) with a can of penetrating oil and pull on the cables to try and find one that won't budge. Worst case scenario is pulling both drums (They're gonna fight ya) and snipping the parking brake cables inside the drums. That would get you moving at least.

Another possibility is that the under-dash mechanism has locked up. Unlikely but possible.

Got her free, it was the underdash mechanism. thanks all!!