Answer:
They keep secrets locked away. And you pass through them each day. For each one there is a key, They respond to sesame.
How many bricks does it take to complete a building made of brick?
This type of corn swells up and bursts into a crisp puff when heated.
What has a neck and no head, two arms but no hands?
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
My days are numbered. What am I?