Jodie, I totally agree that it is not a good practice to shut and lock doors. I also feel it is disrespectful to other students for you to stop class to greet each students that comes in late. My focus would be to establish a policy that you will begin classes on time and for those that come in late, it is their responsibility to meet with fellow students after class or outside the class period to catch up on any necessary notes. This is also where a blended approach could really be of value. You could release your notes after class and allow those that came in late to catch up their own notes and questions outside the classroom in an asynchronous format. I am interested in what others have to say about this situation. No wrong answers here and I am sure this topic will bring forward much debate. Debate is good as we move forward towards a better understanding and better end results.
Regards,
James Jackson