What is the main conflict at the center of the story and who is involved in that conflict?

The main conflict of the story is that there is a bank robbery in progress at the center of the narrative. It is revealed in Paragraph 6 that there are men in business suits and black ski masks standing just inside the bank's entrance. These men intend to rob the bank, as one is armed with a pistol and the other is armed with a sawed-off shotgun.