I put my key card into the card reader and the security arm goes up.

我把钥匙卡放在读卡器上，安捡门的阻拦物就打开了。

youdao

When I put my key card into the card reader at work, the security arm goes up.

当我在工作时间内，我把钥匙卡放在读卡器，安检门的栅栏就会上升了。

youdao

A "security arm" is a long, heavy metal or wood bar that blocks a road, but it can be moved up to let people drive by if they have permission.

一扇“安检栅栏”门是一个长长的，用于封闭道路的重金属或木的栏栅栏门，但如果人们获得允许进入的许可，它就会向上移动让他们进入该区域。

youdao

Just give the security arm a squeeze.

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