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If you have served them with a 7 day notice to pay and they have not done so, then you would file an eviction complaint with the court. The complaint then has to be served on the tenant letting them know when the court date for the eviction hearing is. Once it is served, they then would have the opportunity to show up for court and make any arguments they may have for not being evicted.
Assuming they have no valid arguements, the court would then award a judgment of eviction to the landlord and set a date that the tenant must vacate by (usually 10 days). The tenant is then served a copy of the order by court personnel. If the tenant doesn't vacate, the landlord can get an order of eviction and have the sheriff forcibly remove the tenant and their belongings.
But a landlord can not use "self help" remedies such as changing the locks and taking possession before they obtain a legal judgment from the court and the time to vacate has expired. If the landlord does so, he can be sued for unlawful eviction.
So the short answer is no, you can't change the locks and retake possession after the tenant is served with the complaint.
Ok, you are a little further along than I had initially thought. If you have already gotten an order of eviction, then the only thing left to do is to have the court officer (usually sheriff or constable) serve the order and then you can legally have them physically remove them if they are still in possession of the property. You can then also remove any property they have in the unit.
So as soon as the sheriff or constable serves the tenant, they can be removed the same day.