For those who don’t take the time to follow the link above:
Get rid of the WD 40 (it will attract moisture). And, YES…it is alarming to twist the key that hard. If you decide the lock is really frozen, try a tiny amount of a branded penetrating oil (Kroil, PB Blaster, Schaffer’s Penetro 90). Keep in mind that this keyhole has two functions…one electrical, one mechanical. I regularly lube these keyholes with a THIN film of white lithium grease placed on the key which then I use to cycle the lock.