| Tup, this is rather odd, as the main door does not require a key to open!
I checked today: the main door needs a key to open from the outside, & it is always very laggy as to when it opens. I find it more reliable to r-click first to unlock, & then again to open.
From the inside, the 'locked' icon does not appear. I opened it & trans thru & back a couple of times, then tried opening the main door from the inside after droppping my key token. All worked as expected.
Shoot me a Tell IG if you want to go & check with me, but i suspect this is the work of evil pixies  | 
