LR5 - Sort by ISO?

I have about 1000 images from my son's (and nephew's) graduation. It was later in the day, and I was steadily loosing light,so I kept bumping up my ISO. Now I want to batch process them, including noise reduction, but the NR will be different based on the ISO used. How do/can I quickly sort the files by ISO so I can do each ISO batch? Looking at the exif of each image will take longer then the relatives would want to have to wait.

I have LR5, PS6, DPP, and DXO9, but want to do the processing in LR5.

In the grid view, use the "default columns" filter and you can change any of those columns to list ISO speed.

In the grid view, tap the backslash key and it'll bring up a filter box at the top of the grid. You can filter by three or four different things concurrently.

Or, use a Smart Collection.

I'm glad I read this post... I never realized you can sort by ISO. Thanks!