The following links show how locks work (with varying degrees of success).
Have fun!http://www.burgundy-canal.com/ulockit.html *
http://www.haworth-village.org.uk/nature/how/canal-lock.asp *
https://multimedia.panama-canal.com/Animations/How-It-Works/index.html *
The following site has some time-lapsed boating videos for which you need a fast internet connection. Click on the 'Yes' button after opening the link below, enter the site and then select 'Time Lapsed Videos'.