自定义会话未在asp.net MVC中过期

Question

我在asp.net MVC中使用自定义会话模式，并将超时设置为2分钟。但是2分钟后会议还没有到期？

<sessionState timeout="10" mode="Custom" customProvider="DynamoDBSessionStoreProvider" cookieless="false" regenerateExpiredSessionId="true">
  <providers>
    <add name="DynamoDBSessionStoreProvider" type="Amazon.SessionProvider.DynamoDBSessionStateStore" Region="us-west-2" Application="--" Table="ASP.NET_SessionState" ReadCapacityUnits="3" WriteCapacityUnits="1" CreateIfNotExist="true" AWSAccessKey="--" AWSSecretKey="--" />
  </providers>
</sessionState>
<authentication mode="Forms">
  <forms loginUrl="~/Account/Login" defaultUrl="~/Home" timeout="10" slidingExpiration="false" />
</authentication>