Wire Harness won't open

honda
accord

#1

I am trying to remove the distributor so I can replace the Ignition Control Module and I can’t get the grey wire harness to open so I can remove the distributor from the car. I press the little tab and it releases one side but the far side sticks. I know it opens because when I push it back together it goes click. There is no locking tab on the other side and I can’t pry it open. Suggestions? Thanks.