The hours of voting at voter service centers shall be:
(1) Regular business hours as prescribed in section 11-109 and by the clerk; and
(2) On an election day, from 7:00 a.m. until the closing hour of voting.
If, at the closing hour of voting, any voter is standing in line at a voter service center with the desire of entering and voting, but due to the voter service center being overcrowded has been unable to do so, the voter shall be allowed to vote. No voter shall be permitted to enter or join the line after the prescribed hours of voting specified in this section.