Oh.....THIS thread!
I used to be a locksmith in college to pay my way. My specialty was doors, locks, and windows.
Yes, I've heard and tried the WD-40 VS Graphite deal.
For NEW locks....Yes, graphite is a GREAT way to go.
For OLD locks that have had years of pocket lint, oil from your hands (or whatever) stuck on the key and inserted into the lock, or dirt, grime, and water......WD-40 is the go-to. It will loosen and break down the grime and oil from your hands (or lotion in the case of a women's dorm....) and the liquid is enough to wash the junk out of the lock to free up the pins, springs, and tumblers. The little bit of actual oil that is in there does help to lubricate the lock.
PB Blaster is an actual oil and will attract dust. Is it the end of the world....no. I would use WD-40 to wash it out, then use PB Blaster to lubricate.
Do NOT use Fluid Film to lubricate locks, as that will gum up quickly due to the animal fats in the oil.
Superglue in the locks.........Acetone, but you still have to take out the lock and fully disassemble it, clean each piece with acetone and reassemble. Very time consuming.
Packing the entire tumbler with epoxy: Drill it out and throw it away.
I've seen lots of creative crap to lock people in their rooms (or out of their rooms). I've even had to disassemble door frames to get a kid out of his room because some yahoo superglued the locks, then shoved bamboo skewers in their with more glue, and poured glue behind the lock cylinder. The hinges were inside the room and since we couldn't turn any of the hardware, we stripped the frame and had to build a new one.