Think about visiting a friend who you haven't seen in a while. You may knock on their door and introduce yourself. If there are people who you have not previously met, you may take a few moments to get to know one another. Then they may invite you in. This process takes time to build trust and comfort.
It is helpful to keep this in mind when offering support to others. Remember to take time to:
knock,
introduce yourself,
get to know them, and
provide time for the person to place who you are and what you are asking of them.