75 Pa.C.S. § 3701: Unattended motor vehicle.

(a) General rule.--No person driving or in charge of a motor vehicle shall permit the vehicle to stand unattended without placing the gear shift lever in a position which under the circumstances impedes the movement of the vehicle, stopping the engine, locking the ignition in vehicles so equipped, removing the key from the ignition and, when standing upon any grade, turning the front wheels to the curb or side of the highway and effectively setting the brake.

(b) Penalty.--Any person violating this section is guilty of a summary offense and shall, upon conviction, be sentenced to pay a fine of $5.