MRS PLONY: I would have probably done the same thing, of not bringing him a bigger bill asking to make change.
Have you tried giving someone a bracha?
He comes to the door. You can apologize for not having a dollar bill, ask if he wants a quarter (up to him to say yes or no), and give him a bracha.
(Maybe offer something to eat, like a muffin or cookie, or bottle of water… if you can, and if not move on to the bracha).
And give him a bracha. A good bracha. Ask the man what he needs. And Ask Hashem to give to him generously and let him receive it. Let him say, “Amen.”
Allow him to feel renewed and glad that he knocked on your door.
—Your bracha is powerful.—-