A few things come to mind.

A covered porch. Not so very deep that it will keep the front door in shade during the winter months when the sun is low in the sky but deep enough that when it is high in the sky during the summer months it will be shaded.

An arbor arching over your doorway with vines that will shade your doorway during the growing season yet lose its foliage during the winter months. (Haven't a clue where you live so the choice of vegetation is up to you.)

Long term: Plant a tree in front where it will cast shade during the summer.

Replace your doorknob with one with a heat-reflecting finish?

Use the back door? (Silly, I know but the rest of my answers get even more absurd.)

Wayne