Any person who knowingly confines or detains another without the other's consent and without proper legal authority commits false imprisonment. This section shall not apply to a peace officer acting in good faith within the scope of his or her duties.
False imprisonment is a class 2 misdemeanor; except that false imprisonment is a class 5 felony if:
(a) The person uses force or threat of force to confine or detain the other person; and
(b) The person confines or detains the other person for twelve hours or longer.