I feel like I want to lie to some customers.
What would cause you to lie to customers?
I like to be able to lie in work situations.
Not telling customers the truth is bad. Be honest with them even if it goes against your wishes.
I'll get in trouble if they figure it out.
Telling the truth is tough sometimes and if it is serious, you should offer the customers the truth. Your conscious will feel better if you are honest, even if it costs you some troubles, because you will know you did the right thing.