Any person engaged in the business of keeping a garage or place for the storage of motor vehicles who, in connection therewith, stores or keeps any motor vehicle at the request or with the consent of the owner or person lawfully in possession thereof, whether such owner be a conditional vendee, a mortgagor remaining in possession, or otherwise, shall have a lien upon the motor vehicle or any part thereof for the reasonable charges for such storing and may retain the possession of the motor vehicle or any part or accessory thereof until such charge has been paid. If storage is furnished pursuant to an agreement for a fixed price, the lien shall be for the agreed amount.