fix institutionContract otp bug

ServiceHost/Areas/Admin/Controllers/institutionContractController.cs

@@ -727,8 +727,15 @@ public class institutionContractController : AdminBaseController
     {
         var sem = _locks.GetOrAdd(id, _ => new SemaphoreSlim(1, 1));
         await sem.WaitAsync();
-        var res = await _institutionContractApplication.SendVerifyOtp(id);
-        return res;
+        try
+        {
+            var res = await _institutionContractApplication.SendVerifyOtp(id);
+            return res;
+        }
+        finally
+        {
+            sem.Release();
+        }
     }
 }