1965 Clutch pedal sticks to the floor. Please help I'm desperate!!

My 1965 Mustang coupe, with a 289 V8 engine, is having some issues. The other day while driving, my clutch pedal started sticking to the floor. I immediatly checked the internal system(which i had to work on last year) to see if something was physically blocking the pedal. No such luck. So I used some WD-40 on the moving parts, in case something had gotten stuck. Once again, no change. So from what I've researched it could be the transmission fluid, or my cluch could be bad. Please help me, driving it is not safe at the moment.