My 2008 Grand Caravan key fob will perform every other key fob function except to unlock the doors. Is there a way to pry it open and clean the contact under that button? I have changed the battery and every other button/function works.

 

Take a lead pencil eraser & clean all carbon contacts under the touch pad & battery surfaces . Then I use a Q-Tip with most the cotton pulled off to dab a good amount of silicone grease to all contacts an reassemble for a good operating entry button for ever !!!!!!
O'yes don't forget to apply to the battery contact area for a good voltage current flow !!
All Nissan & Jap cars come with the grease applied from the factory an will last the life of the vehicle ! Lovvorn P.S. I have been boldly told on another post that I was wrong an needed a new button . Try my grease as it has always worked for me on my 2010 GCV . good luck.