Tighten the hinge screws
Replace stripped hinge screws with longer screws
Check for loose or sagging hinges
Adjust the strike plate position
Enlarge or deepen the strike plate hole
Bend the strike plate slightly if needed
File the latch opening if it is misaligned
Tighten the door handle or knob
Replace a worn latch mechanism
Check for door swelling from moisture
Sand or plane the door edge if it rubs
Inspect the frame for warping
Verify the door is hanging square
Replace damaged hinges
Lubricate the latch and strike area
Test the latch after each adjustment