Is it true that the elevator close-door button is completely useless?

电梯的关门按钮真的是毫无用处的吗？

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When a car stops and doors are fully opened , press the close door button , the door close immediately.

电梯停站开门到位时，按下关门按钮，门立即被关闭。

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Today, I was shopping at the mall with some of my friends when I saw an elderly woman in a wheelchair struggling with the handicap door button.

今天我和朋友一起在商场购物，看到一位坐在轮椅上的老太太在费劲的按为残疾人设置的门按钮。

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You try to find the Door Open button but the elevator closes.

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The optical door flips open when the eject button is pressed to protect the drive from dust and potential damage when not in use.

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