Most modern (if you can call them that) pentecostal churches don't seem to 'require' that any longer. There's a new Word-oriented movement in most of these churches now. I can't speak for the south, but in the north they seem to be steering away from trying to make people speak in tongues.
I personally think it's silly and sad that too many believers miss out unnecessarily on the blessing of at least praying in tongues. I'd be up a creek without that.
However, I'm very thankful the one-upmanship and pride aspects and the coercive demanding aspects have waned in such congregations.
I just encourage folks to take the Scriptures on faith and step out in faith--out of the boat, so to speak, and when they've said all they can think to say in their known languages, to pray in whatever sequence of sounds would not be part of a known language to them that might come to their mouth and trust Holy Spirit to be conveying the meaning to Heaven. Works for me.