Siblings live next to a sexy painter

I forgot the movie name but the storyline is like older sister lives with her younger brother. And the younger brother secretly has sex with their painter neighbor who is an matured woman.

It isn’t “the door in the floor” is it?

No it’s not. I just cannot recall what the movie name is.
The sister is looking for a job or something.
The brother is between jobs and spend time messing around with his painter neighbor.