It seems that at some point, a new door type was added to the game with electronic deadbolt locks. Improved Knock, despite saying it can open any door, does not seem to affect these doors specifically. It will let you cast the spell, and it will take your mana to do so, but the door remains tightly shut and locked as if it’s not a valid target for the spell.
It seems unlikely that this is intended behavior since a logically an electronic lock should probably pose almost no trouble for a properly trained technomancer. So I decided to mention it here. Hopefully someone who knows what they’re doing can take a look at it and figure out what needs to be added to the json file for the spell to affect these doors.