EL Expression to make icon available to individual user(s)

Summary

Want to give an individual access to an icon

Content

I'm trying to create an EL Expression so that a specific individual can access a particular icon which links to a report.  This is the expression I am writing (our user names are #s):

#{securityContext.userName['000012089']}

When I validate, I get the following message: The class 'java.lang.String' does not have the property '000012089'. 

What am I doing wrong?

Thanks,

Kelly