Do I Work with an Orangutan?

Question

This morning I found myself face-down in front of a large building. It was obvious that I had taken a great fall from one of the rooms above me, but now I apparently had amnesia.
I went in.
I could tell that the building had been built by an American architect, as the ground floor was designated as the first floor, and I guessed that there might be a basement below me. I started going into random rooms, trying to jog my memory a bit.

1st floor: I poked my head into room 130 and saw someone with a deck of cards. She was staring intently at it, then flipped the top card over with great conviction. She then sighed sadly and scribbled something down on a notepad.

3rd floor: There were a bunch of unsavory mobster-types hanging out by room 364, so I kept going up.

4th floor: I couldn't seem to understand what anyone was talking about, so I continued up.

6th floor: I stopped in room 633 and mellowed out for exactly 7 minutes.

9th (top) floor: I looked into room 910 and was reminded that I had not looked in the basement, so I went back down for a look-see.

Basement: Ahhh! This was finally familiar! I snuggled right into my desk in room 25 and took a nap.

When I woke up I was home, in bed. What a strange dream that had been! Well, no worries, everyone dreams about work sometimes.

What is my job and where do I work?

Answer 1

You are a:

Librarian working in a library

and the rooms are:

Dewey Decimal Classifications

1st floor: I poked my head into room 130 and saw someone with a deck of cards. She was staring intently at it, then flipped the top card over with great conviction. She then sighed sadly and scribbled something down on a notepad.

Dewey Decimal Classification 130: Parapsychology and occultism
The woman is attempting to divine the future, and is either attempting to predict the top card of a deck (as a self-test) or is using the deck as a divination tool (see further: Tarot cards)

3rd floor: There were a bunch of unsavory mobster-types hanging out by room 364, so I kept going up.

Dewey Decimal Classification 364: Criminology
This is where books that study the criminal mind go, especially the minds of career criminals or particularly famous criminals.

4th floor: I couldn't seem to understand what anyone was talking about, so I continued up.

Dewey Decimal Category 400-499: Language
Linguistics, phonology, etymology, grammar, etc. They're all here, across a variety of languages, including "Hellenic languages; classical Greek" (480) and "Austronesian and other languages" (499)

6th floor: I stopped in room 633 and mellowed out for exactly 7 minutes.

Dewey Decimal Classification 633: Field and Plantation Crops
7 minutes is exactly 420 seconds.

9th (top) floor: I looked into room 910 and was reminded that I had not looked in the basement, so I went back down for a look-see.

Dewey Decimal Classification 910: Geography and Travel
Where did you come from? Where did you go?

Basement: Ahhh! This was finally familiar! I snuggled right into my desk in room 25 and took a nap.

Dewey Decimal Classification 025: Library operations
Get back to work!

Connection to title:

In Terry Pratchett's Discworld series of novels, the Librarian of the magical Unseen University is an orangutan. (Don't call him a monkey!)

Answer 2

This answer is weak but I found it intersesting,
Are you...

A writer?

It seems like you are dreaming about

One of your "You are the hero" book, room numbers are in fact page number of the book.
You have encounter so many weird things, I think page 910 told you to go to page 25. I would say the basement was the starting point of your adventure.

Answer 3

You are a

Cleaning lady. Because you have entrance to every floor and every room.

You work in a

Hotel. You have your rooms in the basement (where they ussually have) and there's also a possibility to take a nap. When you woke up, you were home - as you live there.