[error] lock code not working

ok i got a simple door lock code that i upgraded to use pcall to prevent ctrl t from bypassing the lock, but now it will not unlock for the correct password. Also in some cases the ctrl t will terminate the programm. i'm a noob at lua and computercraft programming so do explain if you help.

local pass = "pass"
local side = "left"
while true do
term.clear()
term.setCursorPos(1,1)
term.write("Password: ")
local imput = pcall(read, "x")
if imput == pass then
print("unlocked")
redstone.setOutput(side,true)
pcall(sleep, 5)
redstone.setOutput(side,false)
else
if imput == ("TERMINATED") then
term.clear()
term.setCursorPos(1,1)
print("access denied")
pcall(sleep, 10)
end
print("Incorrect")
pcall(sleep, 5)
end
end

The function pcall(read, "x") returns two values. The first one tells you if there's an error (i think). You want the second one:

local pass = "pass"
local side = "left"
while true do
term.clear()
term.setCursorPos(1,1)
term.write("Password: ")
local _, imput = pcall(read, "x")
if imput == pass then
print("unlocked")
redstone.setOutput(side,true)
pcall(sleep, 5)
redstone.setOutput(side,false)
else
if imput == ("TERMINATED") then
term.clear()
term.setCursorPos(1,1)
print("access denied")
pcall(sleep, 10)
end
print("Incorrect")
pcall(sleep, 5)
end
end

pcall's first return value is a boolean that describes whether or not it encountered an error during exexution.
True means it completed without an error, false means there was an error, for instance someone pressed ctrl+t

oh thank you, i noticed people were using that in there code but thought it as something else. Is there a site that actual explains some of this the computercraft and lua wiki's are not very helpful.