Is the door handle plastic? If so, only touch the handle when closing the door. This works until you have to touch a metal entrance door....

Or hold on to a metal part of the door while your foot touches the ground. Static Guard works, though only for a short period of time.
The seat fabric used in my Focus has a tendency to generate static easily when exiting the vehicle. It is the only vehicle I have ever owned where static can be a problem, even in the summer!