Montessori School Escape

I went to my sisters school to pick her up. I went inside her classroom in search of her but to my surprise no one was there.Thinking that she might have gone with my dad I decided to leave, but the door got locked automatically. Now I am trapped inside the class room.Can you please help me to search for the key of this room?
Price USD 0
License Free
File Size 25.13 MB
Version 1.0
Operating System iOS
System Requirements Compatible with: iphone3gs, iphone4, ipodtouchfourthgen, ipad2wifi, ipad23g, iphone4s, ipadthirdgen, ipadthirdgen4g, iphone5, ipodtouchfifthgen, ipadfourthgen, ipadfourthgen4g, ipadmini, ipadmini4g