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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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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Drago pressed a button and the door closed.

德拉戈按了一个按钮，门关上了。

《柯林斯英汉双解大词典》

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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