Ah, someone has probably been too free with giving door codes to their friends. I once worked in a building where just about every door had a card reader and unless you had the right access clearance your card wouldn't open the door.
Today I woke up at 9:30am, which is very late for me, so I didn't do much in the morning. After lunch I did a bit of clearing up in my bedroom, emptied the waste paper bin and cleared the overflow area around it then I cleared the mound of old printouts off my computer desk, so quite a productive day really.