Is the unit in Chicago? Does the landlord live in the same building?
If your house is in Chicago, your lease is likely regulated by the Chicago Residential Landlord Tenant Ordinance. Under the RLTO a landlord must give the tenant 2 days notice before entry except when there is an emergency or a unexpected need to enter the unit to repair other units.
If the landlord violates this provision, termination is an option as well as recovery of 1 month's rent as a penalty. The landlord is also responsible for the tenant's attorney fees and court costs.
Tenants should not try to terminate their lease or collect a penalty without a lawyer as landlords often react by filing small claims lawsuits.
I have attached a link to an article I wrote on Chicago tenants' rights below.
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