diff --git a/src/main/java/com/example/scoi/domain/auth/dto/AuthResDTO.java b/src/main/java/com/example/scoi/domain/auth/dto/AuthResDTO.java
index cbf8e2b..44afd07 100644
--- a/src/main/java/com/example/scoi/domain/auth/dto/AuthResDTO.java
+++ b/src/main/java/com/example/scoi/domain/auth/dto/AuthResDTO.java
@@ -9,7 +9,7 @@ public class AuthResDTO {
     // SMS 발송 응답
     @JsonInclude(JsonInclude.Include.NON_NULL)
     public record SmsSendResponse(
-            LocalDateTime expiredAt,  // 인증번호 만료 시간 (발송 시간 + 3분)
+            LocalDateTime expiredAt,  // 인증번호 만료 시간 (발송 시간 + 5분)
             String verificationCode   // 개발/QA 환경에서만 포함 (프로덕션에서는 null)
     ) {}
 
diff --git a/src/main/java/com/example/scoi/domain/auth/service/AuthService.java b/src/main/java/com/example/scoi/domain/auth/service/AuthService.java
index 2043ca0..c25381c 100644
--- a/src/main/java/com/example/scoi/domain/auth/service/AuthService.java
+++ b/src/main/java/com/example/scoi/domain/auth/service/AuthService.java
@@ -197,7 +197,7 @@ public String validateVerificationToken(String verificationToken, String phoneNu
     }
 
     // 간편 비밀번호 재설정
-    @jakarta.transaction.Transactional
+    @Transactional
     public Void resetPassword(
             AuthReqDTO.ResetPassword dto
     ) {
@@ -232,6 +232,9 @@ public Void resetPassword(
 
         // 로그인 횟수 -> 0
         member.resetLoginFailCount();
+
+        // RT 만료로 걸린 SMS 재인증 플래그 해제 (이미 SMS 인증을 통과했으므로 잠금 완전 해제)
+        redisUtil.delete(SMS_REQUIRED_PREFIX + phoneNumber);
         return null;
     }
 
@@ -482,18 +485,4 @@ public void logout(String phoneNumber, String accessToken) {
 
         log.info("로그아웃 성공: phoneNumber={}", phoneNumber);
     }
-
-    // 임시
-    public String generateSmsToken(
-            String phoneNumber
-    ) {
-        // 4. Verification Token 발급
-        String verificationToken = jwtUtil.createVerificationToken(phoneNumber);
-
-        // 5. Redis 저장 (10분 TTL)
-        String tokenKey = VERIFICATION_PREFIX + verificationToken;
-        redisUtil.set(tokenKey, phoneNumber, VERIFICATION_EXPIRATION_MINUTES, TimeUnit.MINUTES);
-
-        return verificationToken;
-    }
 }
\ No newline at end of file