The door you just passed through leads you to a small courtyard. There are a few barrels of ale by one wall, a few boxes of tobacco for the hookahs in the bar by another. Weeds sprout up between the cobblestones of the ground and the sky overhead is a light gray overcast. The wall opposite the door has four bricks that seem to have been dented in by the friction of ages of fingers against them. Tap these in the right order and you will enter Diagon Alley