Slave is inside bell housing on the Rangers, so no external lever.
Reads like master failed or its internal check valve.
On the firewall(engine side) there will be a white reservoir with black cap, that's the clutch reservoir, it's hose runs down to master cylinder.
Since push rod to pedal is already disconnected, you can pull out the master cylinder, it is a "twist lock" so you push in while twisting it counter clockwise(1/8 turn) then pull it out.
You should disconnect Slaves hose and unscrew reservoir from firewall so Master can be pulled out for inspection.
The "Quick Disconnect" Ford uses at the slave connection can be hard to separate if it has been on for a few years.
Have look here at the video of how to disconnect the hose:
https://www.youtube.com/watch?v=RVjEMoroZQM
The master end at the quick disconnect has a valve inside, when removed the valve seals the hose.
Symptom of this hose coming off is that the pedal is stuck at the top, you can't push it down because there is no place for fluid to go.
Your symptom reads like fluid has flowed out but no fluid flowed back in, pedal dropped to the floor, so could also be broken hose, but master, reservoir/hose and slave hose come as one piece, so all are replaced if one is broken.