Okla. Stat. tit. 21, § 445

Any person who willfully gains unauthorized entry into any state penal institution, jail, any place where prisoners are located, or the penal institution grounds, upon conviction, shall be guilty of a Class D1 felony offense punishable by imprisonment as provided for in subsections B through F of Section 20N of this title, or by the imposition of a fine of not less than Five Hundred Dollars ($500.00) or more than One Thousand Dollars ($1,000.00), or by both such fine and imprisonment.