Laravel/Lumen: How to return a single value from the first record matching WHERE clause

I'm attempting to return a single column value from the first record matching my where WHERE clause. In the below example from my controller, I'm defining this result as $code. I can either get the first record or I can get a specific column value but not both.

First Record: $code = DB::table('codes')->where('redeemed', '0')->first();

Single Column Value: $code = DB::table('codes')->where('redeemed', '0')->value('code');

How can I do both in a single request?

via sparecycle