Command to find out who locked the file

I have several jobs producing a CPA4072 "Maximum number of spool file records reached in QSYSPRT in QSYS lib." When I do the CHGPRTF on QSYSPRT in QSYS, it always comes back that the file is in use. How can I identify what is using it to put the change in?
Use the WRKOBJLCK command to determine who has a lock on the print file. The command would be as follows:

WRKOBJLCK OBJ(QSYS/QSYSPRT) OBJTYPE( *FILE)

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