I don't know what else to try here. I made a lot of different combinations but it just doesn't work
slidingDoorJoint->SetRotation(0,30,0);
slidingDoorPivot->SetRotation(0,30,0);
slidingDoorJoint->SetRotation(0,30,0, 1);
slidingDoorPivot->SetRotation(0,30,0, 0);
slidingDoorJoint->SetRotation(0,30,0, 0);
slidingDoorPivot->SetRotation(0,30,0, 1);
slidingDoor->SetRotation(0,30,0, 1);
slidingDoor->SetRotation(0,30,0, 0);