How do I get into the shaft?

Hint 1 of 6:

First, move the elevator to level 3.

Hint 2 of 6:

Then, go to the elevator door in the basement.

Hint 3 of 6:

Since you don't have superhuman strength, you'll have to use something else
to open the door.

Hint 4 of 6:

This item will also be used to keep the door open.