Cluch stuck to floor.

The Clutch Master Cylinder or the Clutch Slave Cylinder has a leak. From under the dashboard, located the Clutch Master Cyliner Boot and pry one side open. If hydraulic fluid drips out, the piston seal(s) in the cylinder are worn. You'll need to replace the cylinder.

Try CHECKING AND refilling the master cylinder for the clutch on the firewall under the hood, it looks like a small brake master cylinder tank. Here is a picture of the Clutch Hydraulic Master cylinder. The plastic tank can be black as well. If the tank is full go under the truck on the driver side and check the clutch Slave cylinder to make sure the rod coming out of it is attached to the clutch release arm. Here is a picture of the slave cylinder.
SLAVE CYLINDER IS 1ST PICTURE, MASTER IS 2ND.

The clutch slave cylinder gets it fluid from the "Brake Master Cylinder" resevoir. If the fluid is out there is possibly another problem. Anyhow, there is a bleeder plug on the slave cylinder, make sure the brake resevoir is full and the lid is secured back on then have a friend work the clutch pedal in as you loosen the bleeder on the clutch slave cylinder. Only have the person working the clutch pedal release the clutch after you have retightened the bleeder. AND FOR GODS SAKE AND YOUR OWN DO NOT HAVE THE VEHICLE RUNNING WHEN PERFORMING THIS!!! Many heads have been crushed due to stupidity, not thinking and getting in a hurry.

Clutch master cylinder and clutch slave cylinder are the only two points in which you are describing that could be the issue. Generally it's only one of the two and more typically it's the slave cylinder.

pull up clutch pedal, all the way up. now fill fluid to top, now open the slave cylinder, it should bleed just with gravity. let it drip for a few minutes or until you have to fill it up 2 times. Make sure that when the pedal is all the way up, that the piston is all the way back on the master cylinder. look up at the back of the master cylinder under the dashl. there is an adjustment. you want just very little play between the pedal rod and the piston, just enough that there is some play. but you need some play there. if there isnt any play, adjust the rod.

Chances are the master cylinder has a small lead around the seal that is letting are in when the truck is idle. I would replace the master and slave cylinders to be safe.

Sounds like the clutch slave cylinder. May as well change both the master and slave cylinder. I assume you have already checked the fluid, but if there has been a leak the replacement of the hard parts or just the lines would be necessary to remedy problem.

Was the fluid low? Does the pedal have any resistance? does it feel normal? Did it happen all of a sudden? Does it shift into gear with the engine off? You say it doesnt shift into gear, but does the shifter move into gear or not? Or it does and the truck wont move? Sounds like maybe the SLAVE CYL isnt operating? leaking? theres more questions to answer.

fluid in master cylinder for clutch?

That would be a pressure plate problem.