I already have the master key to the building. I've had it ever since the old AKM locked his keys in the office once and I had to wait an hour for the KM to get there to let me into the office so I could work. That day I asked the MP if there was any way I could get an office key. Instead, he gave me a master key!

I win! Not even any of the normal Key employees have a master key of their own!