How to kill all inactive sessions from a specific user in SQL Server

The SQL statement below will kill all sessions from a specific user that were not active in the last hour.
Of course, change 'my_user' with your preferred user ID. If you want, you can also uncomment the 'program_name' filter if you want to filter on program name.

DECLARE @sql NVARCHAR(MAX) = N'';

SELECT @sql += N'KILL ' + CONVERT(VARCHAR(11), session_id) + N';'
FROM sys.dm_exec_sessions
  --WHERE [program_name] = N'program_name'
  where login_name = N'my_user'
  AND last_request_end_time < DATEADD(HOUR, -1, SYSDATETIME());

select  @sql;
ExEC sys.sp_executesql @sql;