[JumpCrisscross]

> the resistance to something as simple as padlocking a hatch baffles me

We keep hatches simple to facilitate egress [1]. A padlocked hatch must be reliably unpadlocked.

[1] https://nssdc.gsfc.nasa.gov/planetary/lunar/apollo1info.html

[skjoldr]

As mentioned elsewhere, the padlock was only applied and removed in orbit and there were tools available to cut it open in case it seized up