Since the goptions border isn't working in this situation, you could "draw" a border using annotate, as a work-around.
Here's a simple example showing how to do that - you should be able to re-use this anno_border dataset easily with your gchart. Feel free to modify the color and size (width) of the line - I'm using red just so it's more obvious which line it is.
data anno_border; xsys='3'; ysys='3'; hsys='3'; when='a'; function='move'; x=0; y=0; output; function='box'; x=100; y=100; line=0; style='empty'; color='red'; size=1.0; output; run;
proc gchart data=sashelp.class anno=anno_border; hbar name / type=sum sumvar=height descending; run;
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