Passenger door stuck shut/locked

Passenger front door locked closed, cant hear anything from the lock, all other doors fine.

Anyone know how i can get to the lock without destroying the door card, i can wind the window down and take out the rubbers but randomly poking around with a long screw driver doesn't seem to do it. Pretty sure its a corrosion issue due to the common leaky door these cars suffer with just cant get to the screws on the bottom of the door card.

Any ideas please?