My first step would be to call the police. They might at least speak with him. If they can't or won't help, you can file an action in the Court of Common Pleas. You should have an attorney help you with this.
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A simple answer: if you co-own the house, you have a right to enter it to retrieve your things. Now for the problem, the man (whoever he is to you) will not let you enter for some reason - I can imagine many. The foreclosure is a whole other matter. You do not identify which municipality you are in (Exton is just an address), but I suggest you call your local police department (let's say West Whiteland) and tell them you are going to enter the property to get your things. While they probably will not go with you, they need to be alerted in case there is a fight over your right to enter (whose things are whose is another matter). You most likely need to contact a local Real Estate and Foreclosure Attorney to look at all of the documents and give you a more focused answer based on all the facts.
Yep, I agree with the others. Call the cops and see if they'll help. Tell them you want to go to the home to get your things and that he won't let you. If that doesn't work, depending on the value of the stuff in there, you might want to call a local attorney and get a consultation.