How to hold a key

Hi,
I just need to make Sikuli holding a CTRL key while running a function. How can I do that?
Something like a:
def myFunction ():
     hold(Key.CTRL) // still hold this until the for is finished
     for x in findAll("someimage.png"):
    click(x)

and then call a function like this:

myFunction();

Is that possible?