Are electric blankets or throws safe and do they work very well?
Dig up the area, line with thick rubber sheeting made for this found at pool stores, put large stones around to hold rubber edges down layer them in areas for design, add plants, Hide pump in an area you can conceal with rocks and plants.
A locksmith can do this, but be warned that you are looking at BIG money. You need panic hardware on the door so people can get out once the door locks. The timer will need a power source with a battery backup. It would save you a lot of money if you could just train the employee to lock it. Good luck.
