‘Hello, please come to the cake shop and take your cake, it is ready’ is what the caller said over the phone. Wasting no time you got to the boulangerie but there was no inside the shop. You decided to enter it and wait for a while but the wait was turning out to be too long. Suddenly, a gust of cold wind slammed the main door. All attempts to push it open were futile because the door was locked. You are very sure that the owner must be keeping a spare key somewhere inside the shop and the key has to be found and found quickly.