Well Ill jump in and offer some tips based on what I have found. I tried the ICE method but it was annoying and messy, easiest method I found is...light!
I either do it 2 ways, basically you use a small 3 digit combination lock, lock it and you are stuck there until the sun comes up, or the more flexible method is to use a timer set to whatever you want to turn the lights on, I always have a redundancy though just incase