I know it may be a bit of a silly question and not really something of great importance to a story, but how would you secure a spaceship when you leave?
For example; when the Millennium Falcon lands on a planet (not in a hangar bay or anywhere secure but just "in the middle of a forest/desert/wherever") and Han and Chewie exit to explore the planet (leaving the ship unmanned), how would they lock the Falcon to ensure no one could steal it?
The nature of a "best answer" would have to fall into the following constraints:
The ship would be parked somewhere in the open without security/guards/fences - so couldn't be left unlocked/open and would therefore need to be secured completely.
The ship is old, so before a sophisticated AI system would be installed (although the ship is old, it does have an onboard computer system for navigation etc., but much more in the style of the Millennium Falcon - so you can't physically talk to it/doesn't respond to voice commands).
Would need to be fool-proof enough so that the crew using the ship could gain access (if all the crew had exited the ship and "locked" it) - this would eliminate keys/remotes because if half of the group are captured/lost and have the key/remote, the other half will be effectively locked out of the ship. Also during battle a key/remote could be lost or damaged. It also wouldn't be practical to hand out 10 keys/remotes to all crew members.
It would need to be something that could be accessed by anyone in the crew but not necessarily by a stranger (so not just a big red button that locks/unlocks from the outside)
If a control panel on the exterior (or something similar) - what type of power source would it need in order to open/close a ship that is basically turned off/powered down/unmanned? As mentioned above AI wouldn't be able to assist, would there be auxiliary power to lock/unlock the door (would that be mechanically possible?).
Could facial/retina/voice recognition or biometrics work in a Millennium Falcon-type ship for locking/unlocking or is that too sophisticated considering the absence of a "talking AI" and only a primitive onboard computer?
Sorry, I'm new here, so apologies if I'm asking the "wrong type of question" if so any help on where I can ask this question would be greatly appreciated :)