From what you described I suspect the door lock assembly needs replaced. This model of washer has a diagnostic mode that will display an error code by flashing & beeping of the control. You will have to set the control up into a diagnostic test mode in order to review the stored error code. I am sending you the test mode set up & error code list with troubleshooting & testing tips. Please see the image in the attachment provided below for instructions.
before attempting access into the machine.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services
SAFETY NOTICE: Be sure to disconnect power to the appliance before performing any repairs. If you are not comfortable with doing any voltage checks that might be recommended, please contact your local service provider for repairs. Be aware that there could be sharp edges inside the appliance that could cause cuts or other injuries to yourself or others.