Service with a smile has become a nightmare for some Safeway employees who are grimacing at the supermarket chain's policy of cheery customer relations.

Thirteen workers have filed grievances over Safeway's smile-and-make-eye-contact initiative, complaining they've been propositioned by shoppers who mistake the company-imposed friendliness for flirting."Let ME decide who I am going to say hello to with a big smile," said Richelle Roberts, a produce clerk at a Lafayette store who complains she's propositioned daily by male customers. "A woman knows where and when not to open that door for certain men."

Under Safeway's unwritten "Superior Service" initiative, employees are expected to anticipate customers' needs, be courteous, escort them to items they cannot find, make selling suggestions, thank them by name if they pay by check or credit card and offer to carry out their groceries.

Safeway, which is based in Pleasanton and is North America's second-largest supermarket chain, with 1,378 stores in the United States and Canada, began phasing in the policy five years ago.

But it was not until January that it began enforcing it by using undercover shoppers and warning that negative evaluations can lead to remedial training, disciplinary letters and termination.

None of Safeway's 150,000 employees has been fired for failing to be friendly enough, but 100 have been sent to a daylong class, a sort of Smile School in which clerks are given pep talks and suggestions for enhancing the customer's shopping experience.

"We don't have any set rules regarding personal behavior," Safeway spokeswoman Debra Lambert said. "We're not asking an employee to smile in a certain way or make eye contact in a certain way."

But 12 women aired their grievances to Safeway executives in August, and a male employee who said he has been bothered by a female customer joined the effort this week.

The United Food and Commercial Workers union also filed a complaint in May with the National Labor Relations Board, alleging that Safeway's customer service policy was illegally imposed.

"They've got battalions of MBAs who are coming up with these policies at the corporate fort in Pleasanton who don't take into account the real-life implications," said their lawyer, Matthew Ross.

The union wants workers, especially women, to have more freedom to choose not to make eye contact with a potentially threatening customer or to refuse to carry groceries out to a man's car at night.