Open the washer's door at least 90 degrees revealing the hinge screws. Some models have a single, central hinge while other, often older, models have two hinges — one at the top, one at the bottom of the door.
Turning the screws clockwise tightens the connection between the door and the appliance’s body. The door rises to sit parallel with the washer if there was significant sagging.
Tightening the screws visible on the inside of the washing machine door improves the connection between the inner and outer panels. Normal vibration from the washer sometimes loosens these bolts, causing problems closing the door.
Check the holes to the side of the washing machine opening where the latching bolts enter the appliance for signs of dust or debris. Pull out any lint or threads stuck in the locking mechanism preventing to door from properly closing.
Silence squeaking door hinges with silicon-based lubricant available from your local hardware store. Apply a little of the product to the hinge bolts and work it in by opening and closing the door a few times. Vegetable or canola oil also works.