Every Class the Last Class

In my line of work, each and every
Course
Could be the last
Hired as a temp, like I’m typing
(Which I am)
For a living

In my line of work, each and every
Class
Could be the last
There were one, two, three
School lockdowns yesterday
(Hard to keep track)
Where am I?
Under fire,
Fired up,
Or just, relieved, (the relief)
Fired?