Ah, the locked up smog pump. I've seen it about 1/2 dozen times after a car sits for a prolonged period of time.
Pull the output hose off it, spray some WD-40/Liquid Wrench, whatever you choose in there. You may have to give the shaft a few straight on moderate taps with a hammer after a few hours if the penetrating oil itself doesn't free it up. I've been successful with all the ones I've tried to get unstuck.
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