Right side of Autopilot you’ll find a box full of Texts like “L INBD” “LWR CTR” blow these texts you’ll find a bunch of buttons like “ELEC” and “GEAR” among them is the door button click it and a map of the aircraft will appear on your lower screen in the middle pedestal just below the middle screen. Now just click on the doors you want to open and wait for a few seconds. Hope this helps.
This doesn't work on the Nintendo Switch version which is the only one I have.