If I were you I’d speak to my Priest about this. He may not be aware that you and others are being rushed out after Mass. He may be in agreement to keep the church open for 10 or 15 mins after Mass for those who wish to pray.
This would be my suggestion, and I totally agree that being “rushed” after Mass is absolutely uncalled for. I would suggest speaking to the priest and asking if there can be accommodations made. Especially if there are doors in the Church which can be opened from the inside when said doors are locked, this woman’s reaction is even more uncalled for. To take a quote from the Mass - “it is right and just” to give thanks and praise, no matter when it is. Heck, the response used to be “it is right to give Him thanks and praise” before 2011 or whatever. Though I am well aware praying after Mass is not necessarily what is being spoken of at this point in the Mass, I like to personally extend that response to say, “It is right and just to give thanks and praise after Mass for the blessings and graces we have received.” I have never experienced it myself, but I have been told that it used to be common practice to stay and make a Thanksgiving after Mass, and I hope and pray this can become a common practice again.
Oh, I said never - well, actually, I do remember one time I experienced it - I attended a FSSP parish somewhat recently for a Sunday Mass, and when the Recessional Hymn was finished, almost literally
everyone stayed put, knelt down, and made their Thanksgiving while listening to the organ postlude. Many even stayed after the postlude was completed. And this was all with the knowledge/allure of coffee and doughnuts type fellowship waiting for them downstairs…haha

I thought it was all wonderful and…well…“right and just”
Not to say that not doing so is wrong - just that doing so is appropriate and should not be discouraged in any way. I hope you are able to speak with your priest about this!