Luigi Di Ruocco, owner of San Francisco's Coffee Bar, told the San Francisco Chronicle that he was plagued by patrons who used the shop's free WiFi for hours at a time.
The so-called "laptop squatters" deterred new customers because they couldn't find seats, he said.
Di Ruocco decided to limit access to tables.
From noon to 2 p.m., some of the tables have 30-minute limits and are reserved for customers without computers.
As a result, sales have soared 15 to 20%, Di Ruocco said.
"We unclogged the clog," Di Ruocco told the Chronicle. "We made it work for the office workers in the area who wanted to grab a quick lunch. Now they can actually get a table."
Starbucks has also taken measures to keep people from camping out all day.
The coffee chain began covering some electrical outlets at locations in 2011.
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