how to add left margin using lpr

so far I tried

$ lpr -P myprinter -o "page-left=50" document.pdf
$ lpr -P myprinter -o "page-left=50cm" document.pdf
$ lpr -P myprinter -o page-left=50 document.pdf
$ lpr -P myprinter -o page-left=50cm document.pdf

no success.

please help

lpoptions gives me this:

auth-info-required=none copies=1 device-uri=usb://CITIZEN/CL-S521Z finishings=3 job-hold-until=no-hold job-priority=50 job-sheets=none,none marker-change-time=0 media=adobe_w288h360_4x5in number-up=1 page-bottom=0 page-left=0 page-right=0 page-top=0 printer-commands=none printer-info=labelprinter printer-is-accepting-jobs=true printer-is-shared=true printer-location=labelprinter printer-make-and-model='CITIZEN Barcode Printer' printer-state=3 printer-state-change-time=1424186993 printer-state-reasons=none printer-type=36932 printer-uri-supported=ipp://localhost:631/printers/labelprinter