How to lock door without fob or key?

Car:

Statement of fact:

When I have the drivers door open after I leave the car and I press the latch to lock the door before closing the door, the latch goes into the lock position for a second and then pops back to the open position. Also if the drivers door is closed and the rear door is open and I press the fob and then close the rear door the car is not locked. I would like to lock the car with the fob while the rear door open so I can remove items from the rear and close the door so the car is locked. Once my hands are full of packages it is a royal pain in butt to have to close the rear door and then empty my hand to press the fob.

Question:

Is there a way to close the locks while the door(s) are open so that the car is locked when the door(s) are then closed?

Thanks Double Tap