Place the piece of furniture as close to the opening of the door as you can.
How to stop a door from opening without a lock.
Place a door wedge with an alarm under the door to block it.
The latch locks on the door can easily be compromised so you want to make sure that the doors have a secondary level of security to deter burglars and offer up a good fight.
The process of locking is meant to restrict access.
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But there are other methods that can be used to secure a door without a lock such as door wedges and alarms.
A good way of doing this is to insert a bar into the tracks of the door to impede movement and prevent them from being opened.
A door stop is made of plastic or rubber and is wedged into the space between the door and the floor.
Place a door stop behind the closed door closest to the side with the doorknob.
Even a shoe or a slipper can work if the gap is large enough.
If you need to lock a door without a lock you can always resort to removing the handle set and door knob.
A lock does not always have to be present for something to be locked and secured.
Move a large and heavy piece of furniture in front of the door.
Block the door from the inside by stuffing a sock or a similar piece of fabric under the door.
As with steps 1 and 2 this technique works if the door opens inward towards you.
Most people try to block the whole door but right below the doorknob is the area that really counts.