Product review (5 stars): Problem solved, microwave is back in service.  Door opens  as normal.
Our built-in microwave failed, of course this part broke off, could not open the door.  I checked prices on new built-in microwaves, wow!  They are freaking expensive!  So I went to Whirlpool home page, entered microwave model #,  and this part is right on the first page. But, they say you need to call customer service  to replace it.  Really? So I entered part number here on Amazon, bingo! Cannot complain.  Microwave is back in service.  Yes, you need to be handyman to replace it, but is not really that hard. My wife and I just did it.