Instructions
Press a button near a door while facing it to try to open it. Hit the "E" key on your keyboard for the "Use" command that will press this button.
Watch for a small panel to appear on the door. If the door must be hacked, this icon will appear to let you know the lock must be bypassed.
Pull out your hacking device by pressing the "H" key to run a bypass on the door. This usually takes a few seconds, and then the door will be unlocked.
Repeat Step 3 if you encounter a control panel that needs hacking. An icon will appear to let you know you must run a bypass.