Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, the described symptom almost always point to the fine gears of the zoom/lens jammed or even possibly caused by sand, dirt or any foreign matter.
The prescribed fix is to open up the zoom/lens mechanism, clean, re-lubricate and re-assemble. All to be done in a sterile room.
A workaround is to hopefully draw out these possible dirt/sand. Consider placing an active vacuum hose over the zoom/lens while turning the camera On/Off a couple of times. A funnel of sorts may have to be improvised to fit the vacuum hose over.
Please post back how things turned up and/or should additional information be needed.