I thought of different approaches to achieve the goal. When you said it was a real case, I had already sent my response and didn’t want to change it lol.

Well, in this scenario, and considering your update, it’s clear that security is well-prepared in blind spots—they have a great security expert. I still think my approach is valid, though it would need a lot of additional details and refinements, especially if the goal is to gain access only once.

Since you managed to reach the 8th floor via the stairs and the door has a simple lock, wouldn’t a lockpick be viable?

I can only think of approaches that allow you to access the place once, like cloning your friend’s NFC card or even trying to get a duplicate.

An opportunity might be to enter during an event, but that would be a risky move—you’d be burning a chance and might get sent back by the host.