Name: Anonymous 2015-02-05 1:18
A Shabbat elevator is an elevator which works in a special mode, operating automatically, a way to circumvent the Jewish law requiring observers to abstain from operating electric switches on Shabbat.
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A non-Jew known as a Shabbos goy may be employed to press the buttons and hold the door for Jewish people, in buildings that do not have Shabbat elevators. As discussed in that article, a non-Jew is not expected to keep the Sabbath like a Jew. Hence a Jew may benefit from work performed by a goy if the goy performs this work for his own good and of his own free will.
https://en.wikipedia.org/wiki/Shabbat_elevator
[...]
A non-Jew known as a Shabbos goy may be employed to press the buttons and hold the door for Jewish people, in buildings that do not have Shabbat elevators. As discussed in that article, a non-Jew is not expected to keep the Sabbath like a Jew. Hence a Jew may benefit from work performed by a goy if the goy performs this work for his own good and of his own free will.
https://en.wikipedia.org/wiki/Shabbat_elevator