There are many different ways to express the idea of "worked late." Some synonyms for this phrase include "burning the midnight oil," "staying after hours," "pulling an all-nighter," "putting in extra hours," "staying past closing time," and "working into the wee hours." Each of these phrases connotes a different level of intensity or frequency, and can be used in different contexts depending on the situation. For instance, "burning the midnight oil" has a slightly poetic feel and might be better suited for creative or artistic endeavors, while "putting in extra hours" is a more straightforward and professional way to discuss working late at the office.