https://www.fordbarn.com/forum/showthread.php?p=1427486
read and specifically the chart in freeing things up Chris.
WD-40 is really bad for locks as it doesnt penetrate like a legit penetrating oil should, leaves a sticky residue after a while, and gums up locks something fierce.
I would do the atf and acetone mix in a small cup and let it soak for a few days. (acetone eats alot of plastics and especially foam so put it in something acetone proof)