All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
If the tickets that you mentioned in your question are given to buyers of products, and then, a drawing is done to choose a winner of a prize, then there is no harm –Allah willing –for you to work in such a store, whether you are a principal or an employee.
But, if such tickets are sold specifically for prizes and then the drawing is done, then this is forbidden, since it is a form of gambling.
As for your work in such a store, if you have no involvement the above mentioned transactions, you are permitted to work there. It is better and safer, however, to give up such work since you see this evil action and deal with its owner and organizers.
The jurists are of the view that it is disliked to deal with those whose wealth is mixed between what is lawful and what is forbidden.
Then, if you are a manager or a participant in the above work, you are not permitted to work there since it is a form of co-operation in sin and aggression and acceptance of forbidden dealings.
Allah knows best.