This is a limited time Quest. You have seven days to complete it but there is quite a lot to do, especially if you have no intention of forking out real cash for SImoleans or Life Points to speed things up.
The first tricky thing id to find the key to the door. The game tells you there are clues everywhere, so just start clicking on things until you find the clues you need to complete the task and open the door.
Below are the details of EXACTLY what to do in case you run into trouble:
Talk to the Owl, he will tell you to ask the cat, there is a picture of a cat on the wall ask him, he will tell you to look for a particular book, search each bookcase until you find that book then read it. The you need to rearrange the books in the bookcase/door and voilla, you should be in and you can pick up the magic wand.
After that task you need to go home and act casual on the couch - This is a long task, in my game, it takes 10 hours!
Once that task is completed you pretty much have to complete a few other tasks which are straightforward, some of which however can take a hell of a long time, for example you have to distract a mummy in the Park I think about three times, each time is roughly 16 hours!
This is a task where you have a week to complete everything, so there are some pretty lengthy requests in there.
Towards the end of the Quest you will be asked to pick up the Podium and take it the wizard, you will find the wizard in the Park still where you will have to talk to him - this only takes a few hours.