Harry Potter and the Chamber of Secrets - Did He Unlock the Door?
As Harry is escaping from the Dursley's, Uncle vernon is seen putting a key in the lock and unlocking it without a poblem. The scene then cuts to Harry and then back to Vernon who is now fumbling with the key in the lock.
Watch it again, when Uncle Vernon takes the first lock off the door you can see another pad lock below it, then there's also the regular lock at the knob. When it goes back to him fumbling with the lock it's the other two.
I am by no means a Harry Potter expert, but I did just watch this movie on DVD yesterday. It looked to me like there were multiple locks on the door, which would make sense since his uncle wanted to keep him in his room. So it's possible that he unlocked one easily but then fumbled with a different one. Now, I have no idea what's in the book because I never read it -- I'm just commenting on what I saw in the movie.
If you read the books, you would know that uncle vernon locked the door numerous times to prevent harry from leaving. Actually, if the movie was true to the book, this scene wouldn't have occured, as the Weasley's pick the locks and retrieve Harry's stuff from downstairs.