prevent Cache::put() from falling into the forever/zero minute case t…

…hat varies across different drivers (#13869)

src/Illuminate/Cache/Repository.php

@@ -490,7 +490,7 @@ protected function getMinutes($duration)
             $duration = Carbon::now()->diffInSeconds(Carbon::instance($duration), false) / 60;
         }
 
-        return $duration > 0 ? $duration : null;
+        return (int) ($duration * 60) > 0 ? $duration : null;
     }
 
     /**