Check that the "locking latch" isn't in the locked position( as in the when the door is shut and locked) it may be that the latch hasn't fully unlocked when the door was opened and sprung back into locked position.
If mt memory serves me right, the latch in the third pic is a lever to open the door, if the catch ever breaks and the door won't open when shut and locked.
Hope this helps, post back if not, and I'll see if I can give further help. Just for info I repaired domestic appliances for 15 yrs in a previous job.