If at any toll bridge there be a failure to give any person or property a passage over the same in a reasonable time, the proprietor thereof shall forfeit to such person not less than $2 nor more than $20. If the keeper of any toll bridge shall absent himself therefrom without leaving any person in charge of the gates thereon, he shall leave the gates open. Any keeper of a toll bridge who shall fail to comply with the requirements of this section shall be guilty of a misdemeanor, and, upon conviction thereof, shall be fined $50 for every such offense; and any person injured by such failure shall be entitled to recover therefor from such keeper all damages sustained thereby.