Most of government's functions in a modern society are coercive, the role of the police is coercive, prisons are coercive, the system of law and order is coercive-and I suppose you have no problem with prisoners being punished? Taxation is coercive, but without that we wouldn't have roads, a functioning state education system or the police. Coercion itself is bad, but in some spheres it can be used for good. Either way the extent to which the minimum wage is coercive might be exaggerated, a majority of Americans earn above the minimum wage.
To most conservatives that would be a very valid response, but I am an anarchist, so I buy your bluff.
Retaliatory force is positive, that's not what I mean when I say coercion - by coercion I mean initiatory force. The minimum wage doesn't correct some transgression of a contract the employer has neglected - it asserts a price floor and outlaws all free association below that price. Therefore, it falls into the latter category.