[otrs] Can agent change the status of a pending ticket to "open"?

Hi all, Can agent change the status of a pending ticket to "open"? I can NOT find any action in agent ticket zoom in page to change the status of a pending ticket (status: pending reminder, pending close+ or pending close-) to "open". Per the original OTRS ticket status design, which action is agent supposed to take when pending time of a pending reminder ticket has been reached? What is the expected next status of a pending reminder ticket? Thank you! -- Best regards, Edmond Chan