CLUTCH problem.

hey waz up!
i have a NISSAN ALTIMA 2002 2.5 S which is CLUTCH.......
and i have some problem ............
clutch pedal is stuck after pushing it down.......it doesnt go back and gearbox doesnt shift at all when it happends...........ppl at shop told me that its a clutch master cylinder problem
all the time it happends i have to turn off the car......pump clutch dozen times and then try to drive again....its just annoin...........
is there any other things that can cause that to happend.......????

the clutch spring of your car maybe not working at all,and eventually, it affects the running condition of your car.Another thing, too thick nissan floor mats (http://www.shopnisparts.com/nissan-floor-mat/) can also affect the performance of the car regarding in the accelleration, stepping on the clutch and break pedal operation,as it may obstruct the proper functioning of the said pedals that are too near it.