We walked into an elevator only after my sister scanned her retina on an eye scanner. Quickly, her identity was confirmed and were allowed in, only to be met by another layer of security after selecting a button with the number three on it.
"Alright, buddy. Whatever you see in there can not be spread to anybody else, especially since it's a high-tier library. If you have any questions or need to piss or something, then just come back to the elevator. I will be waiting there for you. Also, you only have three hours to pick, so be quick and wise. If you read or absorb more than one skill book, you will be expelled from the academy, and since you're such a troublesome kid, we will have to expel everybody related to you as well."