Make Passcode Lockbox Re-lock When Box Lid Is Closed?

Using Arduino Project Guidance
#1

Hello. I’m a total newbie but have an idea for a geocache container…passcode entry lock box. However, for it to be effective ‘in the field’, I need the box to re-lock automatically after a person finds and opens it (can’t rely on people to ‘press a button to relock’). Closest I could come to finding what I was looking for was in this link https://youtu.be/DCVfT0ZLepQ where he mentions the lock resets to the locked state a few seconds after it’s opened.

Is this possible if using a passcode? If so, any suggested link that may help me learn more?
If not, any suggestions on a different approach to this geocache passcode container project?

Thank you.

#2

If your Arduino passcode program saves the value of millis() when the lock is opened it can certainly reset the lock after a period of time with code something like this

if (millis() - timeLockOpened >= allowedOpenTime) {
   // code to reset lock
}

...R

#3

You could use a switch to detect when the lid is opened and closed.

#4