What has many keys but can’t open a single lock?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

If eleven plus two equals one, what does nine plus five equal?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

How many times can you subtract the number 5 from 25?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?