The translation is fairly standard this week, the exclamation mark is not commonly used (NT Greek does not use this punctuation, so translators have to decide where to put it). However it seems to me that the logic of the verse demands it. The whole point is the reversal, if someone invites Jesus in He invites them to a feast in Heaven!
The door
is typical of the doors we in the one third world would like to
have, yet it's colder and more "closed" than the door
of a shanty town shack....