Old movie - store robbery scene

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Hello, I am trying to remember for quite some tim now from which movie is the scene where the robber enters the store and has the clerk at gunpoint. Clerk does not look up and holds his head down all the time while talking to the robber. At some point, after he gave all the money, he tells the robber that he didn't look at his face and can not identify him, but he gets killed anyway. I think this robber is also main villain in the movie, some serial killer or something.
I can not remember anything from the movie but this scene, I know it is the long shot and not too many info shared from my side, but is worth trying at least.
I know it is an old movie, I watched it when I was kid, maybe even 25-30 years ago. It really bugs me, the fact I can not remember.
Thank you