We had tenants who we issued notice to leave, but the male partner was on drugs and had stopped paying rent because there were worms in the drinking water etc (delusional). Female was fine, but clearly needed to get out of the house and away from him (hopefully).
We issued notices when they were due for non payment of rent, and they had until midnight to hand back the keys (the house is not "ours" until they hand back the keys - not sure if this is still the case).
Hubby could not come with me next morning, so I arranged the day before for the local police to meet me there at 7.30am and they would ensure they left the house.
The day before I drove past and saw them loading their stuff, so I called and cancelled the police presence. We still didn't get the keys back, but got a locksmith in that morning to change the locks. Called the RTA later in the day and they told me that as we had not had the keys handed back, we had no right to change the locks as it was not yet "our house". Too bad, so sad. It was indeed "our house" again, but legally we were in the wrong.
The police were very willing to come to the house with me to "move them along" if they had not moved on their own accord.