Fixed formating for you.

os.pullEvent = os.pullEventRaw
print( "Loading"                )
sleep( 2                        )
print( "----------------------" )
print( "Done loading"           )
print( "Press E to continue"    )
local event, param = os.pullEvent( "char" )
param = "e"
if true then -- ....?
    print( "Choose a number between 1-5" )
    write( "Insert number:  "            )
    input = read()
end
door1 = "1"
door2 = "2"
door3 = "3"
door4 = "4"
door5 = "5"
-- yes = "yes" USELESS VARS
-- no = "no"   <-----------

if input == door1 then
    print( "1 is chosen"     )
    print( "Door is opening" )
    rs.setBundledOutput( "back", colors.red )
    sleep( 5 )
    term.clear()
    term.setCursorPos( 1, 1 )
    shell.run( context )
-- end <- this "end" is not required till you are done using your elseifs and else, I have omited the rest.

elseif input == door2 then
    print( "2 is chosen"     )
    print( "Door is opening" )
    rs.setBundledOutput ( "back", colors.yellow )
    sleep( 5 )
    term.clear()
    term.setCursorPos( 1, 1 )
    shell.run( context )

elseif input == door3 then
    print( "3 is chosen"     )
    print( "Door is opening" )
    rs.setBundledOutput( "back", colors.blue )
    sleep( 5 )
    term.clear()
    term.setCursorPos( 1, 1 )
    shell.run( context )

elseif input == door4 then
    print( "4 is chosen"     )
    print( "Door is opening" )
    rs.setBundledOutput( "back", colors.lime )
    sleep( 5 )
    term.clear()
    term.setCursorPos( 1, 1 )
    shell.run( context )

elseif input == door5 then
    print( "5 is chosen"     )
    print( "Door is opening" )
    rs.setBundledOutput( "back", colors.black )
    sleep( 5 )
    term.clear()
    term.setCursorPos( 1, 1 )
    shell.run( context )

else
    print( "Wrong door number, no door is opening!" )
    sleep( 3                                        )
    print( "Is this understood"                     )
    write( "yes or no: "                            )
    input = read()

    if input == "yes" then
        print( "Remember to use correct room number next time"            )
        sleep( 3                                                          )
        print( "Door selector is restarting! This will take a few seconds")
        sleep( 2                                                          )
        term.clear()
        term.setCursorPos( 1, 1 )
        shell.run( context )

    elseif input == "no" then
        print( "I'll take it as a yes"                                    )
        sleep( 3                                                          )
        print( "Door selector is restarting! This will take a few seconds")
        sleep( 2                                                          )
        term.clear()
        term.setCursorPos( 1, 1 )
        shell.run( context )
    end
end