1, Every door may be shut but death's door. 

2, Opportunity never knocks twice at any man's door. 

3, God never shuts one door but he opens another. 

4, Every dog is valiant at his won door. 

5, One sin opens the door for another. 

6, A creaking door [gate] hangs long on its hinges. 

7, A golden key opens every door. 

8, Every dog is valiant at his own door. 

9, Questioning is the door of knowledge. 

10, Open not your door when the devil knocks. 

11, A creaking door hangs long on its hinges. 

12, Fortune knocks once at least at every man’s door. 

13, A golden key can open any door. 

14, Lock the stable door before the steed is stolen. 

15, An open door may tempt a saint. 

16, It is too late to lock the stable door when the steed is stolen. 

17, He knocks boldly at the door who brings good news. 

18, It's no use locking the stable door after the horse has bolted. 

19, When poverty comes in at the door, love flies out of the window. 

20, It is too late to shut the stable door after the horse has been stolen. 

21, It is too late to shut the stable door when the steed is stolen. 

22, When poverty comes in at the door, love flies out at the window. 

23, It is too late to lock the stable door when the horse is stolen. 

24, A nice wife and a back door will soon make a rich man poor. 

25, If each would sweep before his own door,[http://sentencedict.com/door.html] we should have a clean city (or street). 

26, Don't forget to bolt the door.

27, Ben had got his finger jammed in the door.

28, Is the bolt of the door closed?

29, When the horse is stolen, (you) lock the stable door. 

30, The devil may get in by the keyhole, but the door won't let him out.