Dr. Verizon is here to do a device checkup Sharon513! Let's get your lock button working properly again. May I ask is there any physical or liquid damage on the device? Also, have you verified that there isn't any debris by the lock button? If you have a case on the phone then I would suggest removing it and testing the button to ensure that the case isn't affecting the button's performance. If you are still having issues after these steps then please advise so we can look into additional options.
Follow us on Twitter @VZWSupport
Cplinker, I can understand this being a problem. How long have you had the device? Have you ever had it replaced? Any other issues w/ the device? Please give more details. I am here to help.