How do I get into outer space

Hint 1 of 5:

There's a way to get there south of the warehouse.

Hint 2 of 5:

It's an airlock, so you can't have all of the doors open at once.

Hint 3 of 5:

You need to OPEN DOOR, go DOWN, and CLOSE UPPER DOOR.

Hint 4 of 5:

Now OPEN LOWER DOOR and go DOWN.

Hint 5 of 5:

You also need a space suit and space boots (wear them).