The first quest in Lego Harry Potter Years 1-4 on the iPhone demands finding Dudley's presents. I'm able to find the presents and collect all coins but there seems to be 2-3 rooms including Harry' room which are closed.
There are coins in these rooms but I'm not able to enter them as the doors wont budge. After finishing the quest there comes a cut scene involving the letter from Hogwarts and Hagrid coming to take Harry with him.
After the cut scene Harry is straightaway taken to the Pub which has a path to Diagon Alley without giving me a chance to collect those coins which were left in Dudley's house, because I was not able to enter the respective rooms.
Is there any special way to unlock those doors?