The firm that runs the franchise, Ikhya Enterprises, was fined £12,400 by magistrates at Woking after being found guilty of 20 offences.
The breaches of regulations involved schoolchildren aged 15 and 16. One 15-year-old had worked 16 hours on a Saturday, seven hours over the legal limit. Another 16-year-old had worked from 5pm until 2am on a school day, when legally she should not have worked after 7pm.