Textile workers from Geelong Wool Combing on Thursday invaded the office of one of the company's main shareholders to protest at an ongoing lockout from their workplace.

The four-week dispute hinges over a proposed 25 per cent pay cut that would result from the change from a five to seven day-a-week operation.

Michele O'Neil, state secretary of the Textile Clothing and Footwear Union of Australia (TCFUA) said 41 per cent owner Elders was "trying to get away with starving these workers and their families into submission."

The Federal Court ruled an earlier lockout breached the Workplace Relations Act because employees were not given the legally required notice before industrial action.