diff --git a/src/main/java/xyz/playedu/api/controller/backend/LoginController.java b/src/main/java/xyz/playedu/api/controller/backend/LoginController.java
index 949a4e7..c242171 100644
--- a/src/main/java/xyz/playedu/api/controller/backend/LoginController.java
+++ b/src/main/java/xyz/playedu/api/controller/backend/LoginController.java
@@ -63,7 +63,7 @@ public class LoginController {
         String limitKey = "admin-login-limit:" + loginRequest.getEmail();
         Long reqCount = rateLimiterService.current(limitKey, 3600L);
         if (reqCount > 5) {
-            Long exp = RedisUtil.ttl(limitKey);
+            Long exp = RedisUtil.ttlWithoutPrefix(limitKey);
             return JsonResponse.error(
                     String.format("您的账号已被锁定，请%s后重试", exp > 60 ? exp / 60 + "分钟" : exp + "秒"));
         }
diff --git a/src/main/java/xyz/playedu/api/controller/frontend/LoginController.java b/src/main/java/xyz/playedu/api/controller/frontend/LoginController.java
index 6566fd0..55c9df4 100644
--- a/src/main/java/xyz/playedu/api/controller/frontend/LoginController.java
+++ b/src/main/java/xyz/playedu/api/controller/frontend/LoginController.java
@@ -65,7 +65,7 @@ public class LoginController {
         String limitKey = "login-limit:" + req.getEmail();
         Long reqCount = rateLimiterService.current(limitKey, 600L);
         if (reqCount >= 10) {
-            Long exp = RedisUtil.ttl(limitKey);
+            Long exp = RedisUtil.ttlWithoutPrefix(limitKey);
             return JsonResponse.error(
                     String.format("您的账号已被锁定，请%s后重试", exp > 60 ? exp / 60 + "分钟" : exp + "秒"));
         }
diff --git a/src/main/java/xyz/playedu/api/util/RedisUtil.java b/src/main/java/xyz/playedu/api/util/RedisUtil.java
index 5e80279..a8001c6 100644
--- a/src/main/java/xyz/playedu/api/util/RedisUtil.java
+++ b/src/main/java/xyz/playedu/api/util/RedisUtil.java
@@ -104,6 +104,10 @@ public class RedisUtil {
         return redisTemplate.getExpire(key, TimeUnit.SECONDS);
     }
 
+    public static Long ttlWithoutPrefix(String key) {
+        return redisTemplate.getExpire(key, TimeUnit.SECONDS);
+    }
+
     /**
      * 根据key获取过期时间
      *