There should be a couple of letters in the beginning, the model number will be where you open the door of the machine.
This is a broken door lock and will need to be replaced, call Whirlpool for replacement of the lock since this is under warranty still. Good LUCK and HAPPY NEW YEAR
BONUSES ARE WELCOME but are not mandatoryChas
If that is the way you want to go, the clicking sound is it trying to lock and from the years of doing this, your door lock is what is wrong and it being in warranty is saving you a lot of money, also I recommend the extended warranty on these as they are expensive to repair, this repair would be over $200 if it was not in warranty.