Window and mirror electrics still work but the door stays locked…

I’ve done some research and concluded it’s one of several things:

  • A pillar connector corroded/needs cleaning (unsure how I get to this/seems more likely to impact the rear door)
  • Driver door locking module broken (unlikely as everything else works)
  • Pax Door lock actuator (likely this as I can hear the actuator clicking when unlocking/locking)

I’ve managed to get the door card half removed but am at a loss - I clearly can’t replace the actuator without opening the door, so, how do I manually release the lock to open the door?