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Front door keyhole

Hi help I am a mother of 6 needing a affordable pricing on a job I have or any recommendations please so I just got home and tried to get inside my home and something little and plastic was stuck in my keyhole deep inside when I looked and the key won't fully push in it only go's in half way its dangerous with having children don't want anyone breaking in while we are alsleep I have alot of neighborhood kids running up and down our driveway and found a green peg outside my front door that doesn't belong to us