Key

If decides to wander outside a room that is locked a key is required. However the door could be unlocked requiring only the turning of the handle. The internal mechanisms that sustain this procedure need not be identified or hacked. The emphasis is on opening not on understanding. While the latter can be fruitful in gathering a key too but the former is devoid of many of the complications that attach themselfs to the latter.
Opening is a process whereby one may leave one room for the other thus being exposed to a new decor possibly bringing about an innate change leading to melting of perviously hardened rules that adorn one's character. The lesson learnt here is that the key is not the key. It is the will to open that is the key.