I closed my craftsman door opener from inside by pressing the button and now unable to open it by remote from out side.I don't have access to garage from inside the house.What I can do to open the garage?

Is garage attached to the house, perhaps through scuddle hole.
Any doors windows or openings large enough for a small person/child?

If you haven't gotten in yet, I would cut out 1 small panel if it is that type. Need a door or small door for the garage? Open wall their. Good Luck

One last thought, try fresh batteries and at different locations around the garage.

Based on what you told us so far " closed my craftsman door opener from inside " you'd still be inside. Please clarify.