Seen the video, the key pad only works if the three position switch in the cockpit is in norm, the co-pilot switched the switch to lock and this stops the key pad working.
That doesn't sound likely, if the pilots passed out while the door was switched to lock, then nobody would be able to gain emergency access to help them, which would be ridiculous.
Either way, it wasn't a factor here, as there was no attempt to use the keypad to gain entry.

I told you, when I can be arsed, I do actually take this thing seriously.... rarely... but it does happen.