diff --git a/src/DataEngines/DataEngine.php b/src/DataEngines/DataEngine.php
index 87bd206..6faa47a 100755
--- a/src/DataEngines/DataEngine.php
+++ b/src/DataEngines/DataEngine.php
@@ -14,7 +14,7 @@ public function delete($key, $member = null): bool;
     public function get(string $key, $member = null);
     public function set(string $key, $value, $member = null): bool;
 
-    public function flatList(string $key, int $limit): array;
+    public function flatList(string $key, int $limit = -1): array;
     public function addToFlatList(string $key, $value): bool;
     public function search(string $word, bool $noPrefix = true): array;
     public function valueList(string $search, int $limit = -1, bool $orderByAsc = false, bool $withValues = false): array;
diff --git a/src/DataEngines/EloquentEngine.php b/src/DataEngines/EloquentEngine.php
index 95ce4f3..366dfcf 100755
--- a/src/DataEngines/EloquentEngine.php
+++ b/src/DataEngines/EloquentEngine.php
@@ -87,11 +87,13 @@ public function set(string $key, $value, $member = null): bool
                 'primary_key' => $this->prefix.$key, 
                 'secondary_key' => $member,
                 'score' => $value,
+                'expired_at' => null,
                 ]) instanceof Model;
         } else {
             return $this->model->updateOrCreate([
                 'primary_key' => $this->prefix.$key, 
                 'score' => $value,
+                'expired_at' => null,
                 ]) instanceof Model;
         }
     }
@@ -191,14 +193,14 @@ public function timeLeft(string $key): int
 
     public function setExpiration(string $key, int $time): bool
     {
-        $time = \Carbon\Carbon::now()->addSeconds($time);
+        // $time = \Carbon\Carbon::now()->addSeconds($time);
 
          return $this->model->where(['primary_key' => $this->prefix.$key])
-                            ->where(function($q) {
-                                return $q->where('expired_at', '>', \Carbon\Carbon::now())->orWhereNull('expired_at');
-                            })
+                                ->where(function($q) {
+                                    return $q->where('expired_at', '>', \Carbon\Carbon::now())->orWhereNull('expired_at');
+                                })
                             ->update([
-                                'expired_at' => $time
+                                'expired_at' => \Carbon\Carbon::now()->addSeconds($time)
                             ]);
     }
 }
\ No newline at end of file
diff --git a/src/Keys.php b/src/Keys.php
index 6634afc..2faafab 100755
--- a/src/Keys.php
+++ b/src/Keys.php
@@ -66,7 +66,7 @@ public function cache($limit = '*', $isLow = false, $constraints = [])
         }
 
         //it might not be that unique but it does the job since not many lists
-        //will be generated to one key.eloquent
+        //will be generated to one key.
         $constraintsPart = count($constraints) ? ':'.substr(sha1(serialize($constraints)), 0, 7) : '';
 
         return "{$key}:".($isLow ? 'low' : 'top').$constraintsPart.$limit;