Penalties for False Imprisonment. False imprisonment can be a serious offense in California, resulting in jail time, fines, and a possible felony criminal record.Misdemeanor false imprisonment occurs if the offense does not involve violence, fraud, deceit, or menace. The offense carries a jail sentence of up to one year. False imprisonment is a felony that carries a sentence of 16 months, 2 years, or 3 years in a California state jail. A felony conviction under PC 237 may result in higher fines. Individuals may also end up spending up to three years in jail. California Penal Code § 236 defines false imprisonment as the unlawful violation of the personal liberty of another. False imprisonment is a felony that carries a sentence of 16 months, 2 years, or 3 years in a California state jail. A felony conviction under PC 237 may result in higher fines.