A door in a dream represents a transition from one phase to another.
Walking through a door in a dream can symbolize a movement from one life stage to another, for example, from adolescence to adulthood, or from middle age to old age.
A door or doorway in a dream can represent a change in personal circumstances, such as a new job or a new relationship, or a change in your attitude or your beliefs.
An open door in a dream can signify an opportunity. Opening a door in a dream, and then walking through it, can mean that you are feeling confident about your future.
If you dream that you encounter a door that is shut, and you are unable to open it, you are behaving in an unproductive manner.