July 15 (UPI) -- As millions of people take advantage of sales on Amazon's Prime Day, some employees and activists will use the two-day event to complain about how the company treats workers.

Employees at an Amazon fulfillment center in Shakopee, Minn., plan to walk off the job Monday during the last 3 hours of the day shift and the first 3 hours of the night shift. They say although Amazon has raised hourly wages to $16 to $20 -- more than double the federal minimum -- the company sets unrealistic expectations and quotas.

"They try to get someone to work as hard as you can under the threat of being fired," two-year employee Tyler Hamilton told CBS News. "As much as they can, they figure out ways to collect data and measure work."

Employees also complain of unsafe work conditions, lack of communication from supervisors and an over-reliance on temporary workers.

"We're forced to work like machines," Hibaq Mohamed told Forbes. "I see it as abuse."

An Amazon representative said the company has addressed the protesters' concerns.

"We provide great employment opportunities with excellent pay -- ranging from $16.25-$20.80 an hour, and comprehensive benefits," the company said. "We encourage anyone to compare our pay, benefits and workplace to other retailers and major employers in the Shakopee community and across the country -- and we invite anyone to see for themselves by taking a tour of the facility."