Hello, the movie I am looking for is, as far as I remember, a French movie / nouvelle vague / black & white. Probably 60s. The scene I remember is a boy running down a street at night with a cane in his hand, rattling it against a steel fence while running. I think you only see his feet and it was somehow a dream sequence. Finally he stops at a closed movie theater, he reaches with the cane through the closed steel gate and steals a movie poster.

It might be Truffaut ? Anybody recognize this?