work overtime — to work beyond normal working hours

an exhausted office worker sits hunched over a computer with papers scattered across the desk. Coffee cups and food containers pile up nearby showing many hours of continuous work. Through large windows behind, the city skyline shows darkness with streetlights glowing. A wall clock displays a very late hour while most office lights remain off except this workspace. A security guard walks by in the background, surprised to see someone still working. The janitor empties trash cans around the nearly empty office floor. working beyond normal working hours into the night