I am the box that holds keys without locks, yet they can unlock your soul. What am I?

What has a face but no head, hands but no arms?

What stays hot even if we put in the refrigerator?

What is it that everybody does at the same time?

I'm a four-digit number.
My 2nd digit is twice greater than my 3rd.
The sum of all my digits is thrice greater than my last digit!
The product of my 3rd and 4th digits is 12 times greater than the ratio of my 2nd to 3rd.
What am I?
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