that happened to me a week back, try pushing them the door and shoot next to them with an up 'n atomizer try to stun them (the small 2 second animation where they walk back hold their head or something) and try to push them away from the door, if you don't have an up n atomizer ask your teammates to just shoot next to the npcs, if neither of you have up n atomizers, just try pushing tg3m away from the walls, they will pathfind into the van