Create Identical Symmetric Keys On Two Servers?

why my script is not allowing me to DECRYPTBYKEY once I restore my DB from PRODUCTION BACKUP....

-- SET Staging to Single User Mode to be able to RESTORE DB---

-- STEP 1 (Works No Problems Here)

USE master;
GO
ALTER DATABASE Staging
SET SINGLE_USER
WITH ROLLBACK IMMEDIATE;
GO
RESTORE DATABASE Staging
FROM DISK = 'C:Program FilesMicrosoft SQL ServerMSSQL11.MSSQLSERVERMSSQLBackupMyDBRestore.bak' ;
GO

-- STEP 2 - USE ONLY IF THE ABOVE IS UNSUCCESSFUL ||| FAILURE ****** RESTORE RUN THE FOLLOWING SCRIPT -----

--If the above is successful the DB sets itself back to MULTI_USER

--ALTER DATABASE Staging
--SET MULTI_USER;
--GO
--ALTER DATABASE Staging
--SET READ_WRITE
--GO

-- STEP 3 (Works No Problems Here)

--------------- @@@@@@@@@@@@@@ IMPORTANT UNCOMMIT AND RUN @@@@@@@@@@@@@@@@@@@@@@@@@ MANUAL STEPS ----------------------
-- RBD - Recreate Security ID'S AND PERMISSIONS FOR Stored Procedure EXECUTE RIGHTS, because PASSWORDS are different on lower
-- environments
--USE [Staging]
--GO
--/****** Object: User [WebUser] Script Date: 4/13/2015 11:15:51 AM ******/
--DROP USER [WebUser]

[code]....