You could also try Kroil, which is hardcore stuff.
My recommendation would be to give a "dry" lube a try, though. Locks can get pretty gummy if you use too much wet lube and you'll have to reapply it all the time.
Liquid Wrench Dry Lubricant is available almost anywhere and won't get gummy. The carrier in the spray should also clear out the WD that's in there, too.
Maybe get a small screwdriver and dry to jiggle the cover back and forth to work the lubricant in.
The amazing thing about the space age stuff is it works on circuit boards and electronics too. It may take a couple of days to seep in (vs taking a switch apart), but the electronics are renewed after 20 years like new. As cheap of a solution as it is (50 cents an application or less), no wonder its a consistant top 10 Amazon product in it's class. Wet lube, dry lube, ... , forget that: it's in a class by itself.
However, once the lock cover is restricted, it may signify the internal springs have sprung through the melted/deformed plastic (or it's about too.) If it holds off a while, at least it wouldn't ground him immediately. The next thing will be not being able to insert the key due to plastic/spring garbage in key hole. Then you are grounded
I would start getting the parts ready though, since the labor is the main thing to worry about for most non-pro mechanics. With up to a couple weeks getting the parts, it can ground you for a while if you don't plan it out start to finish.
And when I fished a jewelers screw driver in the ignition lock cover, I pulled out a long wiry springs with plastic bits on it. That was the finals straw and I could not get a key in afterwards. I'd be very careful about doing that (it's an oem trap, lol.)