A Starbucks barista strike is expanding to include about 5,000 workers at more than 300 stores in 45 states, just as the company’s busy holiday season begins.

While it still only accounts for about 3% of all Starbucks locations in the U.S., it’s an expansion of a promotion that began in three cities last week.

The strike, organized by the Service Employees International Union and Starbucks Workers United, is intended to draw attention to alleged unfair labor practices and stalled negotiations over a contract that would include thousands of workers. Workers are demanding an immediate increase in Starbucks’ minimum hourly wage of up to 64% and more than 77% over the life of a three-year contract.

“After everything Starbucks has said about how much they value partners across the system, we refuse to accept no immediate investment in barista wages and no resolution of the hundreds of open unfair labor practices,” said Lynne Fox, president of the Workers union a statement: “Baristas know their worth and will not accept a proposal that does not treat them as true partners.”

In a memo sent by the company to employees, a Starbucks manager called the union’s demands “unsustainable” while touting the overall package of benefits workers can receive. He found that employees who work at least 20 hours per week are paid an average of $30 per hour. when combining pay and social benefits.

“The union decided last week to withdraw from negotiations,” said Sara Kelly, executive vice president of Starbucks. “We stand ready to continue negotiations when the union comes back to the bargaining table.”

Starbucks saw a surge in investor sentiment after it poached Chipotle CEO Brian Niccol to head the coffee chain in August, although its stock price has since fallen in recent weeks along with the broader market decline.

Niccol has pledged to negotiate with the union in good faith, even though his previous tenure at the burrito chain was marked by at least two worker settlements requested by the National Labor Relations Board.