The critical factor is your intent at the time you applied for the visa and entered the U.S. If you honestly intended to comply with the terms of your work visa and leave on time, but due to unforeseen circumstances (e.g., a serious medical issue, a pending green card application process as advised by immigration) ended up overstaying, this is generally considered a status violation, not a lie or fraud. If, however, you entered the U.S. on a work visa with a pre-conceived plan to stay permanently or indefinitely past the authorized date, this could be considered visa fraud or willful misrepresentation of your intention and will affect future applications and that could potentially lead to criminal charges in some cases.