Judge Inglis said she did not accept any of the employees were undertaking an approved course of study to train for the role of pharmacy technician, which is required if an employer is paying trainee wages.
"As none of them was ever enrolled, they were underpaid for the entire period of their employment."
Vohora had appealed an Employment Relations Authority finding to the Employment Court.
Judge Inglis did not impose a penalty sought by the labour inspector for failing to keep accurate wage records, saying while Vohora's record keeping left something to be desired, she was not satisfied a penalty was appropriate.
The parties were invited to reach agreement on costs.
Ministry of Business Innovation and Employment Labour Inspectorate general manager George Mason said in a statement yesterday the ruling should serve as a warning for employers.
"Exceptions to the minimum wage are narrow and clearly defined. A training wage can only be paid to staff that are doing 60 credits a year with a recognised industry training organisation.
"The ministry takes all minimum wage breaches seriously and employers can expect to face strong and determined enforcement action if they refuse to comply with the law."
When contacted, Vohora told the Otago Daily Times he did not accept he had breached the law. However, he would not appeal the judgement.