Thanks for the reminder! I have the same issue and I have a little wood shim I turn into a little sunshade. The old one had fallen off so this was a good reminder to go replace it.

I have a similar problem. My garage faces North. In the Fall and Spring, the sun rises and shines directly into the sensor. Back when I left every morning at that time, I'd get out of my car, and cast a shadow so the door would close. Another option was to move the garbage bin so it cast a shadow, but it wasn't tall enough to work for the whole time.

A tube might have worked, but then what would I complain about?

Haha, had a client recently modify a sleeve from a whiskey bottle. Same effect just with a whiskey theme.