how to use sendkeys

I want to insert ‘Enter’ Keys but failed

This is what I found from guide

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https://docs.katalon.com/display/KD/[WebUI]+Send+Keys

'Press Ctrl+A to select all text in txt_Comment'
WebUI.sendKeys(findTestObject('txt_Comment'), Keys.chord(Keys.CONTROL, 'a'))
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Here is my question. What should I do for just hitting 'Enter' keys?
WebUI.sendKeys(Keys.ENTER)
Please let me know how to do this

If you just want to hit’ Enter’ key:

WebUI.sendKeys(findTestObject(null), Keys.chord(Keys.ENTER))