We supply bar code scanners that can input those pass numbers for you. When you get to the prompt that asks for the pass number, it is a lot easier to scan a bar code than it is to manually type in six or more numbers and letters. This also provides an extra layer of control, because the scanner will never get the number wrong, whereas a Cashier under pressure may accidentally type in a number incorrectly.
We highly recommend our scanners to any park that sells special passes and has a problem with long lines. A few seconds isn't a lot by itself, but after the hundreds of visitors you may have in a day, it really starts to make a difference. For the Parks where we have already implemented these scanners, the reaction has been very positive and efficiency has improved.