You've got to shade it. At least here in the Phoenix area, I've seen white, modern insulated doors that absolutely cook in the summer sun when facing south or west. Painting might help if it is currently a dark color, but it's still going to suck.
I've got some triple-pane, glazed, low-e, argon-filled windows about which I could tell a similar story :) There's no better cure for direct sunlight than to avoid it. The solution may not be as pretty as the current situation, but your neighbors live in the same spot you do -- they'll understand. Just don't do something gaudy.