trying to read the last record in vsam file

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COBOL

Move High-Values to Ws-Key

ExEC CICS STARTBR
FILE(LOGICAL FILE NAME)
RIDFLD(WS-KEY)
END-EXEC

EXEC CICS READNEXT
FILE(LOGICAL FILE NAME)
INTO(WORKING-STORAGE-AREA)
END-EXEC

EXEC CICS READPREV
FILE(LOGICAL FILE NAME)
INTO(WORKING-STORAGE-AREA)
END-EXEC

EXEC CICS ENDBR
FILE (LOGICAL FLE NAME)
END-EXEC.

I am trying to read the last record in vsam file using above code.But each time while executing it will only read the 1st record so i can't do auto increment on it.What should i do?