Good Riddles

Question: You put me in hard.
But then I become soft.
Blow me hard and I will get bigger.

What am I?

Question: No matter how hard you try,
I can open what you can't.
If it wasn't for me,
on your front porch you would stand.

What am I?

Question: I have no wallet but I pay my way.I travel the world but in the corner I stay.

What am I?

Question: You put me in dry but then I get wet.
The longer I stay in, the stronger it will get.

What am I?

Question: For now I must stay under the man who made me,
but when he dies I'll be as powerful as he.
They will watch and listen to what I say,
then some of their money to me they'll pay.

Who am I?