Closing the dryer door

Turn the screw in the end of the shaft (on the door end) counterclockwise to release all the pressure.Once it closes or slams shut, use that screw to adjust the closing speed. Other problem could be the stay open lock (the metal piece that slides along the shaft) could be all the way out keeping the door from closing. If it is just push on the door a bit then slide the lock plate all the way back to the end of the shaft, and the door will close.

If the door will not stay closed it is the spring inside door, or the small plastic piece that holds the spring which is attached to the $80.00 piece called outer door.
To fix it, it is EASY and you do not have to even take the inside cover all the way off. Just remove the three sides of cover by gently slipping a plastic putty knife around rim to release the clips. Then attach the spring to the small hole below where the plastic piece used to be, which is located in the metal on the glass frame piece, use tweezers, hold the other end of spring as you place spring onto plastic door latch and set into place!
Snap the inside cover back on and YAY! FINI!

If the door will not stay closed it is the spring inside door, or the small plastic piece that holds the spring which is attached to the $80.00 piece called outer door.
To fix it, it is EASY and you do not have to even take the inside cover all the way off. Just remove the three sides of cover by gently slipping a plastic putty knife around rim to release the clips. Then attach the spring to the small hole below where the plastic piece used to be, which is located in the metal on the glass frame piece, use tweezers, hold the other end of spring as you place spring onto plastic door latch and set into place!
Snap the inside cover back on and YAY! FINI!

lift the handle and open the latch back out with a pen, or screwdriver.

there is a plastic part that attaches to the lower hinge that helps keep the door closed. it is like a rocker that when the door is open the door rides up on the plastic rocker then as you close the door the door rides down on the hinge rocker and helps to force it closed. mine stopped closing on it's own then all of a sudden the black plastic piece broke and fell to the floor. I am ordering a new piece if I can find the part number.

best way is to take door off and take it apart, metal tabs inside hold firm to door body.

I found sufficient information elsewhere.

There is typically a small plastic piece that catches the door and keeps it latched. The door has the male side and the frame of the dryer has the female side.

Either the male part on the door has broken off (or bent) or the the female part on the frame has broken. Replace this part and you'll be back in business. It is typically called a door latch and it comes with both the male and female parts.

Here is a picture of a typical one.

Look for the switch on the memory card door of your camera. Usually a small piece of plastic on the door closes the switch when the door is closed. Check to make sure that the plastic piece is not worn down and is making contact with the switch. You can confirm that this is the problem by powering on the camera while closing the switch manually with a toothpick. Make sure you keep your fingers clear of the extending lens while doing this. If the plastic is worn down or broken off, try attaching a small piece of scrap plastic with super glue.

Got it. It was the door switch. I wrote that it "could suddenly break, I guess" and that's just what happened. The switch is not in the latch; there are no wires in the door. The switch is mounted on the upper right of the door frame. There's a black plastic paddle that closing the door pushes back. Ours broke off (making it harder to see). I'll order a new part, but for now, I taped a piece of plastic to the door that reaches the broken switch.

By the way, if you are new to dryer repair, as I am, you might not know that the top deck is hinged at the back. You have to pry up the front (there are two rubber restraints) after disconnecting the lint trap shaft. The door switch is easily accessible from the top (at the right). Don't forget to turn off the power.