Vehicle: 93 ISUZU BIGHORN 3.1 TDI 5 DOOR POD FILTER, 2 1/2" EXHAUST AND FREE FLOW MUFFLER HOME MADE 3" SNORKEL AND HANKOOK RT03 265/75/16 (32") MUD TYRES.
Just checked on mine and after hurting my thumb turning mine on I came up with the answer brute force and ignorance. Could be worth opening the door panel and spraying some lubricant in the direction of the lock
Sanding your knuckles before starting work can help. That way you cant skin them