As we've mentioned many times before, you NEED content for your reel. It's essential. A lone scene will only demonstrate a limited aspect of what you can or cannot do and thus getting out there and participating in voluntary or student projects is a must.
Being a writer/director, I've learned how vital this is even for my profession. When seeking investors or grants for projects, the main aspect they're looking to judge from me is what I've done. So, get yourself onto Craigslist, Kijiji, or any of your hundreds of local classified areas and submit yourself to get involved with whatever someone has begun. It may prove worthless, and that it just goes to demonstrate your experience, but maybe it'll prove an asset and be that big slice of your work to get your foot into the right doorways.