Basic Programing help

How would i code a program that opens a door for 3 minutes and then shuts it. I know i can use
redpulse direction 1 180
but i want something shorter and quicker to type.
Also i need to know how to create this program.

On top of that, how would i make a program that waits 30 minutes and emits a redstone pulse, then restarts the 30 minute timer.

this type of thing can be found in the tutorials. pretty mutch the same as a key lock door.
just remove the password part and set the sleep(time) to the wanted open time.

Not tested, my code:

repeat
print("Press Enter to open door or type 'exit' to exit.")
input = read()
redstone.setOutput("right", true)
sleep(180)
redstone.setOutput("right", false)
until input == "exit"