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[TBayToyotaBoy]

I had exactly the same problems (fussy drivers-side lock, passengers-side seized completely) plus a seized trunk lock mechanism. Go to a good scrap yard (where they let you do the work yourself and charge minimal prices) and pay a locksmith the measly $17 per cylinder to have them re-keyed.

After they're in, keep using the lock de-icer/lubricant. Even in the summer, because water gets in. Use it about once a month (just a quick spray will do) and you'll never have problems again--unless the actuating rods seize too (like mine did)