The tub cover not only has a drain plug in the bottom but also has an open grid along the lower edge. If this was just a matter of water in the door boot, it would drain out on its own. The fact that it is still standing means the water has not drained from under the tub. I usually unplug the machine, go around back and clamp off the hose between the tub and the pump, then remove the pump (left one is the drain pump while looking in from back). There may be a quarter stuck in the pump intake or sumpin.
Pinch off pliers (auto parts store)