Answer:
I turn around once. What is out will not get in. I turn around again. What is in will not get out.
I am a word with 5 letters. Bold are the first; true are the second; playful are the third; clever are the fourth; forceful are the fifth.
I fill a room but take no space.
Things here are usually tagged with red stickers.
2 in a corner 1 in a room 0 in a house but 1 in a shelter.
What is always coming but never arrives?