'staff lined up' is a correct and usable phrase in written English.
You can use this phrase to describe the action of personnel forming a formation, such as a line or a queue. For example, "The staff lined up for the morning meeting outside the supervisor's office."
The staff lined up outside the front door as we motored down the rhododendron-lined drive.
And when Mrs. Ford returned from her mastectomy, the staff lined up with signs reading, "We love you, Betty".
We weren't too late — only a few tables were taken — and the staff lined up to greet Seidler.
The feast ended after 4 a.m. with the entire restaurant staff lined up on the street outside, waving good night.
The D.S.P. sat on a chair placed in the middle of the hall, with the quivering staff lined up in front of him.
Televisions at an assisted-living facility north of Fort Lauderdale had for days been tuned to the weather channel when, on Friday morning, the staff lined up all 200 residents outside on the driveway.
A funny montage by Thomas Nast, from Harper's, parodies the hotel's celebrity: it shows a giant trunk arriving at the Mountain House, burying a porter beneath it, staff lining up for tips, artists clustering under umbrellas to paint "unspoiled" nature and hotel guests stumbling around nearby Kaaterskill Falls.
Debunking the diabolical theory that Google will take as long as it likes to release its Maps App, in an effort to convert people to Android, I've got a source telling me that the Google Maps team is taking this as a crisitunity, doubling down on staff, lining up the team and resources to have a standalone iOS app in the App store "before Christmas".
Students, staff and faculty lined up in front of Homewood's Levering Hall last Wednesday to play a game of guess the water: bottled or filtered tap.
Mrs. Clinton and Mr. Obama are outspending him, bringing in sophisticated campaign staffs, lining up crucial endorsements and drawing crowds that have numbered in the thousands.
Besides a gaggle of reporters, photographers and Secret Service agents, there were no staff members lined up to greet the president, although he was trailed by weary-looking staff members who accompanied him in the motorcade.
