We've had weaners try to sleep outside too which isn't too bad on warm nights, i've seen me many a time on hands and knees crawling inside arks to encourage them to come and go to sleep in the straw and then creeping out when they've all gone to sleep,

OH thinks i'm too soft with them but i'd fret if they were out in the cold & damp.
As for pigs banging on back doors i have sows who regularly on their travels round the house/lawn duff up the back door, once when i hadn't shut it properly found my two oldest girls going thro the kitchen bin troffing who knows what delights

and Clover was found in the conservatory after scoffing the dogs dinner when pasing thro uitility room! The worse thing is they never ever forget, and always try again!
mandy