The key to city is not so simple as the LAW declares. Obviously when you make a key, you make a lock.(unless you are the locksmith)
Now if you have the "key to the city", all you have to do is find the lock to the city, and the city is yours according to RULE A1. The location of this lock is unknown. Perhaps it stares you right at the face, perhaps it is behind another lock.
Give us the gate key. I have no gate key. FEZZIK, tear his arms off. Oh, you mean this gate key.